| [GMCnet] Mileage, trailers, and toads. [message #288387] |
Thu, 08 October 2015 22:00  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Got to thinking about towing on the way back from Rapid City. When I pull my open trailer with a car on the trailer. My GVW is about 17,000 lbs. I then get around 8.6 MPG. When I'm towing Linda's Chevy Uplander lift van on a dolly. My GVW is also around 17,000 lbs. On our last trip pulling the Uplander. I got 10.122 MPG. The only thing that seems to be. Is that the Uplander fills the air stream of the GMC better by it's length. So is a longer toad better then a short one? Bob Dunahugh78 Royale Convertible78 Royale Mouse House
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| Re: [GMCnet] Mileage, trailers, and toads. [message #288399 is a reply to message #288387] |
Fri, 09 October 2015 06:39  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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My experience Bob is to use a MPG average. Every fill can be
different based on the levelness of the coach, etc. I've had my gas
mileage per trip range from 6.9 to 11.7. On my most recent trip
going to the campground fully loaded with full water tanks, etc., I
got 9.22 mpg and on the return trip with tanks empty, food gone, etc.,
I got 8.93. There are many variables like terrain, driving habits
and speeds.
Ray
On Thu, Oct 8, 2015 at 10:00 PM, Bob Dunahugh wrote:
> Got to thinking about towing on the way back from Rapid City. When I pull my open trailer with a car on the trailer. My GVW is about 17,000 lbs. I then get around 8.6 MPG. When I'm towing Linda's Chevy Uplander lift van on a dolly. My GVW is also around 17,000 lbs. On our last trip pulling the Uplander. I got 10.122 MPG. The only thing that seems to be. Is that the Uplander fills the air stream of the GMC better by it's length. So is a longer toad better then a short one? Bob Dunahugh78 Royale Convertible78 Royale Mouse House
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Ray Erspamer
78 Royale - "The Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMCRoyale@gmail.com
414-484-9431
Web Site: http://ray-lisa.page.tl/
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Mileage, trailers, and toads. [message #288400 is a reply to message #288387] |
Fri, 09 October 2015 07:30 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Bob,
Since the weight is the same the improvement in mileage is due to a reduce coefficient of drag. It could be the length of the "towd"
or it could be the fontal area of the towd and the amount of drag it creates. Perhaps Linda's Chevy Uplander presents a better
"face" to the turbulence off the back of the GMC?
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob Dunahugh
Sent: Friday, October 09, 2015 2:01 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Mileage, trailers, and toads.
Got to thinking about towing on the way back from Rapid City. When I pull my open trailer with a car on the trailer. My GVW is
about 17,000 lbs. I then get around 8.6 MPG. When I'm towing Linda's Chevy Uplander lift van on a dolly. My GVW is also around
17,000 lbs. On our last trip pulling the Uplander. I got 10.122 MPG. The only thing that seems to be. Is that the Uplander fills
the air stream of the GMC better by it's length. So is a longer toad better then a short one? Bob Dunahugh78 Royale Convertible78
Royale Mouse House
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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] Mileage, trailers, and toads. [message #288557 is a reply to message #288431] |
Mon, 12 October 2015 10:50 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Hi Bob
Post a lot of pictures of the renovation, I'm sure many of us would
love to see the process and progress.
Thanks
Ray
On Fri, Oct 9, 2015 at 12:29 PM, Bob Dunahugh wrote:
>
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> I'm vary aware of the filling issue with the GMC. All my mileage calculations that I've used have been on trips over 2500 miles. Then averaged with others of similar distances. Plus I never use data that's out of the Midwest plains states. So I think I have some good data. It just appears that the shape of the Chevy Uplander really has a vary good profile for behind the GMC. My 78 Royale is totally stock down to the Carb on the 403, except for Jim K's 3:70 final drive.Bob Dunahugh78 Royale Convertible78 Royale Mouse House
>
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> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
--
Ray Erspamer
78 Royale - "The Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMCRoyale@gmail.com
414-484-9431
Web Site: http://ray-lisa.page.tl/
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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