Home » Public Forums » GMCnet » [GMCnet] What is the best fuel economy obtainable from a GMC Motorhome?
| [GMCnet] What is the best fuel economy obtainable from a GMC Motorhome? [message #241053] |
Sun, 23 February 2014 20:19  |
Chris Orr
Messages: 29
Registered: February 2014
Karma: 0
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Junior Member |
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I've just joined this mailing list in order to get some technical
details from owners who may have performed fuel saving modifications. I
am interested in getting a motorhome and have considered the GMC
Motorhome for it's spaciousness and contemporary and clean-lined design.
It's a very stylish vehicle even in 2014! I've read somewhere that
adding fuel injection and modifying the top gear ratio will improve the
economy well over the notorious 6-8 mpg I've read about. If anyone has
done this, what real world MPG ratings have you had after mods? By mpg,
I mean miles per American gallon, not the imperial gallon.
Apart from the above mods, is there a diesel engine that might fit this
coach? If so, has anyone done it and what is the real world MPG for a
diesel engine. In Australia, many RVers use a Toyota Coaster diesel bus
which can be imported. Of course it's not as lovely as the GMC, but it
does have a fuel economy of 12l/100km or 20MPG (American gallon), which
is only 1/3 the fuel consumption of the GMC. Is this possible to achieve
with the GMC, with its double axle rear wheel?
Thanks,
Chris.
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| Re: [GMCnet] What is the best fuel economy obtainable from aGMCMotorhome? [message #241081 is a reply to message #241077] |
Sun, 23 February 2014 23:12  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Chris,
Here you go:
http://www.gmcmhphotos.com/photos/g3432-restoration-and-diesel-conversion.html
I'm going to send you some info specific for Aussies Off Net.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris Orr
Sent: Monday, February 24, 2014 3:54 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] What is the best fuel economy obtainable from aGMCMotorhome?
Thanks Robert,
How can I contact Marc Hogenboom. I'd like to find out what diesel
engine he put in, and what driving style he does to get this mileage.
Cheers,
Chris.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241082 is a reply to message #241077] |
Sun, 23 February 2014 23:18 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Chris,
Don't mean to rain on your parade, but it doesn't matter which diesel engine you install or what your driving style is it will take forever to offset the acquisition and installation cost for the diesel with fuel cost savings.
So if your idea is save money by increasing mpg- you can't get there from here. But, if you like to change things just because you can, then then enjoy yourself.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241088 is a reply to message #241082] |
Mon, 24 February 2014 03:24 |
cadelec
Messages: 303
Registered: September 2011
Location: Brisbane Australia
Karma: 1
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Chris
i reckon you could do an LPG conversion for around 2-3 Grand scrounging secondhand parts and doing a lot of the install yourself this will give you about the same running costs as Deisel and still retain the 455
Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241089 is a reply to message #241082] |
Mon, 24 February 2014 03:43 |
Mr ERFisher
Messages: 7117
Registered: August 2005
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and that's the truuuttttthhhh.
we have spent 20 years, doing this stuff, and been down these roads, over,
and over...
so do it, if you like it, but for the right reasons :>)
erf
On Sun, Feb 23, 2014 at 9:18 PM, gene barrow <barrowgene@gmail.com> wrote:
>
>
> Chris,
> Don't mean to rain on your parade, but it doesn't matter which diesel
> engine you install or what your driving style is it will take forever to
> offset the acquisition and installation cost for the diesel with fuel cost
> savings.
> So if your idea is save money by increasing mpg- you can't get there from
> here. But, if you like to change things just because you can, then then
> enjoy yourself.
>
>
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
Gene Fisher -- 74-23,77PB/ore/ca
"Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241091 is a reply to message #241089] |
Mon, 24 February 2014 04:02 |
Chris Orr
Messages: 29
Registered: February 2014
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Thanks for your advice. I don't own one yet, and probably never will
because of the poor mileage. Still what a cool vehicle. I'll be looking
at something with a modern mileage economy instead.
On 2/24/2014 1:43 AM, gene Fisher wrote:
> and that's the truuuttttthhhh.
>
> we have spent 20 years, doing this stuff, and been down these roads, over,
> and over...
>
> so do it, if you like it, but for the right reasons :>)
> erf
>
>
>
> On Sun, Feb 23, 2014 at 9:18 PM, gene barrow <barrowgene@gmail.com> wrote:
>
>>
>> Chris,
>> Don't mean to rain on your parade, but it doesn't matter which diesel
>> engine you install or what your driving style is it will take forever to
>> offset the acquisition and installation cost for the diesel with fuel cost
>> savings.
>> So if your idea is save money by increasing mpg- you can't get there from
>> here. But, if you like to change things just because you can, then then
>> enjoy yourself.
>>
>>
>> --
>> Gene Barrow
>> Lake Almanor, Ca.
>> 1976 Palm Beach
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241093 is a reply to message #241091] |
Mon, 24 February 2014 05:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Chris,
Before you rule out the GMC, be sure you consider the whole costs of
ownership. Fuel cost may prove to be less important than acquisition cost,
taxes (especially age-determined annual ones), recurring maintenance costs
(especially the necessity for "professional" service, the availability of
parts and advice, and perhaps most significant, depreciation.
It's hard to beat the GMC's total cost-per-mile over time.
JMHO,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL
www.gmcwipersetc.com
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] What is the best fuel economy obtainable from aGMCMotorhome? [message #241100 is a reply to message #241093] |
Mon, 24 February 2014 06:57 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Ken,
I thought Chris was in Australia so I sent him a whole bunch of information on diesel's conversions and gave him my contact details
in Sydney so I could walk him through the import process; however, it turns out Chris lives in British Columbia.
In a private email he noted that he has zeroed in on getting a Vixen. I have seen photos of them and they look pretty cool too but I
know nothing about them so I refrained from commenting.
I agree with your assessment of the GMC from a cost-per-mile / cost of ownership.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Ken Henderson
Chris,
Before you rule out the GMC, be sure you consider the whole costs of
ownership. Fuel cost may prove to be less important than acquisition cost,
taxes (especially age-determined annual ones), recurring maintenance costs
(especially the necessity for "professional" service, the availability of
parts and advice, and perhaps most significant, depreciation.
It's hard to beat the GMC's total cost-per-mile over time.
JMHO,
Ken
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241103 is a reply to message #241075] |
Mon, 24 February 2014 07:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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At 55 on Cruse and real gasoline, my 23' >once< did 12 from Asheville to Braselton (all downhill freeway). Punched t6o 2500, it shows 62, does about 65. No toad just at 10, toad just at 9. This on a box stock driveline and at the time 90k miles. I don't see it doing a lot better anytime soon. On feces gasoline when the real stuff isn't available, it sags to 9 solo, just above 8 toading.
--johnny
________________________________
From: Ken Burton <n9cv@comcast.net>
To: gmclist@temp.gmcnet.org
Sent: Sunday, February 23, 2014 11:29 PM
Subject: Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome?
My stock engine 26 foot GMC will do 10 mpg if I keep it at 60 mph or below with the AC off. Of course everyone else on the road wants to run 75 mph. You soon learn to just ignore them.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241107 is a reply to message #241091] |
Mon, 24 February 2014 08:19 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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If your prime concern is mileage over cost to acquire and maintain, unless you propose to live in the thing and drive it daily, it probably isn't going to matter. Consider, I've run mine about ten thousand miles in a couple of years. At 9mpg and 3.25 a gallon, it's cost me $361 a thousand to run it. at 15 - which I question but anyway - and 3,90 a gallon for Diesel, it costs 259 a thousand. Saves maybe 500 bux a year. Relative to an engine swap, not a poot in a whirlwind. Now if you ran it the same thirty thousand a year I seem to do in a car, it becomes somewhat more attractive but still doesn't pay out. I discount the increased maintenance costs of the diesel here.
As an interesting exercise, however, it sounds like complicated fun.
--johnny
________________________________
From: Chris Orr <c000rr@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, February 24, 2014 5:02 AM
Subject: Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome?
Thanks for your advice. I don't own one yet, and probably never will
because of the poor mileage. Still what a cool vehicle. I'll be looking
at something with a modern mileage economy instead.
On 2/24/2014 1:43 AM, gene Fisher wrote:
> and that's the truuuttttthhhh.
>
> we have spent 20 years, doing this stuff, and been down these roads, over,
> and over...
>
> so do it, if you like it, but for the right reasons :>)
> erf
>
>
>
> On Sun, Feb 23, 2014 at 9:18 PM, gene barrow <barrowgene@gmail.com> wrote:
>
>>
>> Chris,
>> Don't mean to rain on your parade, but it doesn't matter which diesel
>> engine you install or what your driving style is it will take forever to
>> offset the acquisition and installation cost for the diesel with fuel cost
>> savings.
>> So if your idea is save money by increasing mpg- you can't get there from
>> here. But, if you like to change things just because you can, then then
>> enjoy yourself.
>>
>>
>> --
>> Gene Barrow
>> Lake Almanor, Ca.
>> 1976 Palm Beach
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMC Motorhome? [message #241109 is a reply to message #241053] |
Mon, 24 February 2014 08:31 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Grade and winds are the 2 external factors we have little control over. If all your mechanicals are tweeked and you keep you foot out if it then 10 MPG is realistc average. A sustained 30 mph wind can add or subtract 5 mpg to the 10avg depending on the vector. You are not realistically considering that in a motorhome a very large day count per year the key is OFF and not draining your wallet. Also factor in tradtiional vacation airfares, hotels and restaurant meals and the GMC is probably the most inexpensive vacation option. When buying any used old vehicle there is the initial expense of going through all the systems to insure consistent reliability.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241116 is a reply to message #241107] |
Mon, 24 February 2014 09:42 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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.Thanks for your advice. I don't own one yet, and probably never will
>because of the poor mileage. Still what a cool vehicle. I'll be looking
>at something with a modern mileage economy instead.
Well, I use the thing to go to dog shows. It gets roughly half the mileage my Mopar minivan(s) get, they're about as small as I can use to haul a dog or two (100 - 120 pounds) plus show tack. RV site runs about half a motel. Since most show sites have RV facilities, I don't have the hassle of schlepping dogs back and forth motel to show, finding someplace to set up my tack in the grooming area, keeping the dogs in tow in a close area, etc. I figure it ends up costing me about the same either way. I've the added benefit of stepping out the door to the canopy and grooming stuff, and walking to ringside in five minutes or less. And, I can cook meals which work better for me that the (delicious but not real healthy for a diabetic) stuff available at the show sites. All up, I figure the money is a wash and the convenience leans heavily towards the GMC. I can't find anything else with a full bathtub under 50 Large anyhow.
I looked at some older RVs, Vixen didn't have the room or the installed base to support it. I have visions of RD'S Service in Gastonia putting a water pump on one with no notice in a day and getting me back on the road to the show in Salem VA for $550 or so. Same for the Ultravan, plus I had enough trouble keeping Corvair engine operating in a 500 coupe. Don't believe I want to mess with it in an RV.
--johnny
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] What is the best fuel economy obtainable from aGMCMotorhome? [message #241117 is a reply to message #241100] |
Mon, 24 February 2014 10:04 |
Ultravan Owners
Messages: 443
Registered: March 2013
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| USAussie wrote on Mon, 24 February 2014 07:57 |
Ken,
I thought Chris was in Australia so I sent him a whole bunch of information on diesel's conversions and gave him my contact details
in Sydney so I could walk him through the import process; however, it turns out Chris lives in British Columbia.
In a private email he noted that he has zeroed in on getting a Vixen. I have seen photos of them and they look pretty cool too but I
know nothing about them so I refrained from commenting.
I agree with your assessment of the GMC from a cost-per-mile / cost of ownership.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Ken Henderson
Chris,
Before you rule out the GMC, be sure you consider the whole costs of
ownership. Fuel cost may prove to be less important than acquisition cost,
taxes (especially age-determined annual ones), recurring maintenance costs
(especially the necessity for "professional" service, the availability of
parts and advice, and perhaps most significant, depreciation.
It's hard to beat the GMC's total cost-per-mile over time.
JMHO,
Ken
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Rob,
Vixens are cool. When I worked on consignment as a mechanic for a small shop I had a customer who had the 5 cylinder diesel.
The last job I did on it was a timing belt.
It took special tools to set up the pump and it was not worth the shop or a mechanic to buy them for a one time job.
However, the customer want to know who was working on it and the Vixen group has one of, if not the only support system of its kind - that I have ever heard of or had the fortune to be a part of.
The Vixen owner signs up in the club/group and has nation wide support.
I called the Vixen shop and gave them the owner's info. They spoke with the owner and shipped the tools needed on his credit card. Once I was finshed I shipped them back. The owner only had to pay the shipping cost and the deposit for the tools was refunded to his card. Their tech support is great too. But then again I was in the USA and not British Columbia. 
Tony (Ontario Canada)
Marie and I are blessed to have had a 2nd chance to buy our farm.
Still hoping and more importantly praying to be able to build a garage.
Our 1970 Ultravan #520 has an Olds Toronado 455 in back.
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241119 is a reply to message #241077] |
Mon, 24 February 2014 10:07 |
dwayne jacobson[1]
Messages: 345
Registered: July 2009
Karma: 0
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Senior Member |
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Hi Chris;
so it appears you are from BC. I too live there - White Rock in fact and
in addition to my coach there are several other BC GMC coach owners.
I would be happy to let you view our coach, go for a drive, ,aybe even let
you drive it. Can then talk about all the pros and cons.
my email is dwayne.jacobson@gmail.com
Before buying the GMC I too looked at a Vixen - rear engine - nice but then
I looked at the communities and resources of both and GMC won GOLD.
I doubt you will find a better support group than right here.
regards
Dwayne
On Sun, Feb 23, 2014 at 8:54 PM, Chris Orr <c000rr@gmail.com> wrote:
> Thanks Robert,
>
> How can I contact Marc Hogenboom. I'd like to find out what diesel
> engine he put in, and what driving style he does to get this mileage.
>
> Cheers,
> Chris.
> On 2/23/2014 7:45 PM, Robert Mueller wrote:
> > According to Marc Hogenboom 14-15 with his diesel powered GMC.
> >
> > Regards,
> > Rob M.
> >
> >
> > -----Original Message-----
> > From: Keith V
> >
> > 8 to 10 depending on if you tow...
> > 12 if you spend 10,000 on a 8.1 vortech...
> >
> > Keith
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
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>
> _______________________________________________
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--
Dwayne Jacobson
White Rock BC
Cell: 604-644-8090
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| Re: [GMCnet] What is the best fuel economy obtainable from aGMCMotorhome? [message #241120 is a reply to message #241117] |
Mon, 24 February 2014 10:14 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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The Black List is the same thing on an informal basis. The very situation you describe is why ultimately the Vixen didn't suit my needs- which are admittedly somewhat different from the average RVer. We got 'ol George' to repair my pulley when the pump died and trashed it, had we not, I still had time to call the Left Coast and get one on the plane for early morning delivery. Between our suppliers, I can do that for dam' near every part on the miotorhome that isn't available down at Advance.
I applaud your choice, the Vixens ought to be kept going just like the GMCs.
And as an aside, I'm told the three sheave pulley is common only to the motorhome installation. True or not true, gurus?
--johnny
________________________________
From: Tony <Ultravanman248@yahoo.com>
> In a private email he noted that he has zeroed in on getting a Vixen. I have seen photos of them and they look pretty cool too but I
> know nothing about them so I refrained from commenting.
>
> I agree with your assessment of the GMC from a cost-per-mile / cost of ownership.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> -----Original Message-----
> From: Ken Henderson
>
> Chris,
>
> Before you rule out the GMC, be sure you consider the whole costs of
> ownership. Fuel cost may prove to be less important than acquisition cost,
> taxes (especially age-determined annual ones), recurring maintenance costs
> (especially the necessity for "professional" service, the availability of
> parts and advice, and perhaps most significant, depreciation.
>
Rob,
Vixens are cool. When I worked on consignment as a mechanic for a small shop I had a customer who had the 5 cylinder diesel.
The last job I did on it was a timing belt.
It took special tools to set up the pump and it was not worth the shop or a mechanic to buy them for a one time job.
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Unsubscribe or Change List Options:
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
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| Re: [GMCnet] What is the best fuel economy obtainable from a GMCMotorhome? [message #241126 is a reply to message #241091] |
Mon, 24 February 2014 12:19 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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All 12000 gmc owners are laughing when you say this, they are great for gas for the size and power.
I demur. You would be a lucky persons just to have one and be on this great list to help you find the truth.
Mickey anaheim ca. made in the space age, 1977 gmc palm beach motor home.
On Feb 24, 2014, at 2:02 AM, Chris Orr wrote:
> Thanks for your advice. I don't own one yet, and probably never will
> because of the poor mileage. Still what a cool vehicle. I'll be looking
> at something with a modern mileage economy instead.
>
> On 2/24/2014 1:43 AM, gene Fisher wrote:
>> and that's the truuuttttthhhh.
>>
>> we have spent 20 years, doing this stuff, and been down these roads, over,
>> and over...
>>
>> so do it, if you like it, but for the right reasons :>)
>> erf
>>
>>
>>
>> On Sun, Feb 23, 2014 at 9:18 PM, gene barrow <barrowgene@gmail.com> wrote:
>>
>>>
>>> Chris,
>>> Don't mean to rain on your parade, but it doesn't matter which diesel
>>> engine you install or what your driving style is it will take forever to
>>> offset the acquisition and installation cost for the diesel with fuel cost
>>> savings.
>>> So if your idea is save money by increasing mpg- you can't get there from
>>> here. But, if you like to change things just because you can, then then
>>> enjoy yourself.
>>>
>>>
>>> --
>>> Gene Barrow
>>> Lake Almanor, Ca.
>>> 1976 Palm Beach
>>> _______________________________________________
>>> GMCnet mailing list
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>>>
>>
>>
>
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