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| [GMCnet] Fuel Consumption [message #137824] |
Sun, 07 August 2011 03:33  |
steve n
Messages: 79
Registered: July 2007
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Every now & then, there's been some chatter on here about fuel usage with the Onan running to power both of the roof A/C's versus running with the dash A/C on.
Unless my math is wrong, which, of course, it never is (???), it seems to me that running with the Onan going uses a little less fuel then using the dash A/C - Not to mention the increased power without the drag on the coach engine and the more even interior cooling which benefits our 4 dogs while on the road.
I've tried to find some definitive stats on this on the various sites & postings but can't seem to.....which, I guess, is normal, because according to my wife, I can't find anything.
Is my math & theory wrong - anyone have any thoughts or stats on this?
Thanks,
Steve Nowak
F26083
'78 Royale Center Kitchen
TZE368V101877
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Steve Nowak
F26083
'78 Royale Center Kitchen
TZE368V101877
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| Re: [GMCnet] Fuel Consumption [message #137828 is a reply to message #137824] |
Sun, 07 August 2011 05:41  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Steve,
I reckon running the numbers would not be anywhere as accurate as doing it.
Give it a go next time you take your GMC out for a trip.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: fluffyms
Every now & then, there's been some chatter on here about fuel usage with
the Onan running to power both of the roof A/C's versus running with the
dash A/C on.
Unless my math is wrong, which, of course, it never is (???), it seems to me
that running with the Onan going uses a little less fuel then using the dash
A/C - Not to mention the increased power without the drag on the coach
engine and the more even interior cooling which benefits our 4 dogs while on
the road.
I've tried to find some definitive stats on this on the various sites &
postings but can't seem to.....which, I guess, is normal, because according
to my wife, I can't find anything.
Is my math & theory wrong - anyone have any thoughts or stats on this?
Thanks,
Steve
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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] Fuel Consumption [message #137849 is a reply to message #137828] |
Sun, 07 August 2011 09:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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What is that old engineering theory? Statistics never lie, but statisticians
frequently do! <Grin> Your results may vary.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Sun, Aug 7, 2011 at 3:41 AM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Steve,
>
> I reckon running the numbers would not be anywhere as accurate as doing it.
>
> Give it a go next time you take your GMC out for a trip.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: fluffyms
>
> Every now & then, there's been some chatter on here about fuel usage with
> the Onan running to power both of the roof A/C's versus running with the
> dash A/C on.
>
> Unless my math is wrong, which, of course, it never is (???), it seems to
> me
> that running with the Onan going uses a little less fuel then using the
> dash
> A/C - Not to mention the increased power without the drag on the coach
> engine and the more even interior cooling which benefits our 4 dogs while
> on
> the road.
>
> I've tried to find some definitive stats on this on the various sites &
> postings but can't seem to.....which, I guess, is normal, because according
> to my wife, I can't find anything.
>
> Is my math & theory wrong - anyone have any thoughts or stats on this?
>
> Thanks,
>
> Steve
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Fuel Consumption [message #137864 is a reply to message #137849] |
Sun, 07 August 2011 10:17 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Jim,
To quote Mrs. Gardner, fifth grade math teacher; "figures don't lie but lots
of liars figure!"
Or:
"There are three kinds of lies: lies, damned lies, and statistics."
Popularized by Mark Twain who attributed it to British Prime Minister
Benjamin Disraeli.
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 James Hupy
What is that old engineering theory? Statistics never lie, but statisticians
frequently do! <Grin> Your results may vary.
Jim Hupy
Salem, OR
78 GMC Royale 403
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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] Fuel Consumption [message #137880 is a reply to message #137824] |
Sun, 07 August 2011 12:40 |
Oldngray
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
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Some time ago I posted the following,
I tried using the Onan and the roof air instead of the Dash air, after 2 trips totally 1700 miles, I found that the difference in MPG dropped from 8.9 with the dash air to 6.8 with the Onan and roof air.
It may well be that my Onan is not set up right but it sure starts and runs nicely.
JWID
Richard MacDonald Punta Gorda, Florida 76 Edgemonte TZE 266V102313
Richard MacDonald
Punta Gorda, Florida
Sold our TZE April 2015
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| Re: [GMCnet] Fuel Consumption [message #137897 is a reply to message #137824] |
Sun, 07 August 2011 15:01 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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I no longer have the original Onan in my coach, but the Generac I replaced it with uses 1/2 gallon/hour at full load. If you were getting 10 mpg at 60mph, you'd burn 6 gallons in one hour just driving down the road.
Adding another 1/2 gallon to that amount would drop the fuel consumption down to 9.23 mpg (assuming I remember my algebra correctly) if you're traveling at 60 mph.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Fuel Consumption [message #137931 is a reply to message #137824] |
Sun, 07 August 2011 18:43 |
chasingsummer
Messages: 434
Registered: May 2011
Location: asheboro, nc
Karma: 0
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with only one roof ac on sitting in drive way i got better than 2 hours off one gallon. so i assume sine my wife rides at sofa a,d ac cooling her, then onan and roof ac much better than dash ac.
brian
asheboro, nc
75 eleganza, 74 build
119k miles and counting,
DOG HOUSE
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