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Old 09-13-2015, 07:29 AM   #21
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When I was young, I drove a Carmanghia. It is the streamlined version of the Volkswagon. I put a luggage rack on it so I could take my john boat to the lake. I couldn't pass semi-trucks without a running start because of the wind coming around the semi, and my mpg went from 40 to 30. I left the luggage rack on for a while, and just the rack dropped my mileage 2 mpg. I've often wondered if leaving the back bunk of my Roo open wouldn't give me better mileage, but I don't think I'll try it.
You could make up your own Trailer Tail! Youroo!!
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Old 09-13-2015, 08:12 AM   #22
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Seven years ago my wife and i bought a Sydney Outback 31 footer and averaged 11 mpg over many trips. We just bought a TT Forest River Wind jammer. We were told the V shaped front end and lighter weight should give us better MPG. After several trips with the new TT we found it get 11 MPG. This doesn't upset us that much, but I thought it would be better than that. As my Dad used to say "It's only money." By the way we pull with a GMC 2500 Duramax with towing package.
Interesting for a diesel as I tow a 35 V-lite with Chevy 6.0 3/4 ton and get 9.4mpg. Mpg sounds low for your truck. Later RJD
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Old 09-13-2015, 01:53 PM   #23
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Naked my 2014 Cummins PU got 22 gals per mallon , I added a topper that was 10 inches taller than truck , miles dropped to 19 ! Height makes a diff !
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Old 09-13-2015, 03:46 PM   #24
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UPDATE:

Ok it gets better... Loaded the new TT (Vengence 25v) up. 50 gal water. Food clothes chairs coffee maker etc etc etc.

Drove 40 miles to a local states park for the weekend. Got 10.9 mpg..

I musta just had a high head wind coming from the dealer.......
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Old 09-13-2015, 04:19 PM   #25
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Mileage upset

We have a 2015 GMC Denali HD with a 6.6 and tow a RW 8315bss which is about 34 ft. And get about 12 mpg at 70mph when I tow friends work trailer which is about same height but about 1\2 the weight and only 16 feet long we only get about 10 mpg at 70 mph. A engineer friend thinks as do I that tbe air flow around the tt has more tims to level out and smooth out before reaching the back of it but on the shorter trailer the air flow is still swirling around wben it gets to the back and then makes a vacuum behind and suckes at the rear so creating more drag. Long winded but only thing we could come up with.
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Old 09-13-2015, 08:24 PM   #26
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The frontal area is key and affects the mileage. Other thing to consider is that your Diesel will get better mileage as it gets broke in. I've got a 2010 Ram 2500 6.7 diesel w/4x4 and after 22-25,000 miles I saw mileage improvement.
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Old 09-13-2015, 09:00 PM   #27
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Originally Posted by tommybill View Post
The frontal area is key and affects the mileage.
^^^^ THIS!
Affects fuel mileage much more than weight.
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Old 09-13-2015, 09:21 PM   #28
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just wondering, maybe you should tow the new camper back to the pale you bought it, then compare the gas mileage
it would mimic the same exact trip, and give you the answer to whether it is the camper or not
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Old 09-13-2015, 09:36 PM   #29
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Air drag on our trailers and 5ers comes as much from the square corners as anywhere, especially at the back. You can V the front and curve the front cap, lean it back and curve the top, etc... but it's only a small part of the equation... Truckers are adding panels to the backs of their trailers, and along the bottom in an effort to tame that airflow down some, and make less drag. If they can save 2 or 3 percent in fuel, it can add up to big bucks... like the winglets on jet liners.
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