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Old 09-12-2015, 08:07 AM   #1
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Fuel Millage vs 2 different TT's

Almost first post and new to TT. Well not really new when I was a lot younger the family used to TT about every other weekend.

I'm using a 2015 RAM 2500 with 6.7 Cummins CC 4x4 1500 miles give or take.

I just traded in my SNL's Jayco 32' BSDH TT for a 25' Vengeance 25V TH .

I towed the Jayco to the dealer and got 11.1 MPG.

On the trip back with a empty/dry 25v my MPG dropped to 10.3????

How is this possible with a shorter lighter RV?
It is 1 ft higher and 6 in wider. Could that make that much difference in MPG?



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Old 09-12-2015, 08:20 AM   #2
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Is the dealership downhill from home? (Sorry, couldn't resist)

But seriously, maybe others can help explain if you have some some information to share (speeds and distances traveled, traffic, weights of rigs, wind conditions, etc.). Congrats on your new rig.

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Old 09-12-2015, 08:23 AM   #3
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Fuel Millage vs 2 different TT's

If you were towing with the wind going to the dealer and against coming home could make that difference. I also believe that the increased frontal area will have more effect than the one foot length. Aerodynamics is a tricky thing because you not only dealing with how the trailer goes through the air but how the air goes around the tv and then hits the trailer.

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Old 09-12-2015, 08:24 AM   #4
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I averaged about 65 mph and since its near the coast (Savannah, GA) it's pretty flat.

No wind that I noticed...

After looking at the specs between the two TT I'm thinking the greater ht and width may be the factor...

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Old 09-12-2015, 08:29 AM   #5
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since your taller and wider, you will always be pushing more air for sure. That is as much of a factor as anything.
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Old 09-12-2015, 08:31 AM   #6
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My previous 5r was a 30' Cougar 10,300# GVW, I would average 10 - 11 mpg towing it all day long. Sold the Cougar and bought a Rockwood ultralite 30' 5r with a GVW of 9,300#. I'm sure we pack about the same when we travel but mpg did not change one bit, still getting 10 - 11 mpg. I can see the 1k difference at the cat scales, I decided it's not the weight so much as is the frontal resistance to the wind. Both 5r's are about the same hight and width.
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Old 09-12-2015, 08:49 AM   #7
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How about the tires? We changed the original tires that came with the trailer for a new set of Carlisles and immediately noticed the difference - a much smoother, easier tow! And the mileage went up, too (from 8-9 mpg to 10-11 mpg in tow/haul mode). Some tires have better rolling resistance than others. Just a thought.
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Old 09-12-2015, 09:37 AM   #8
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Air drag goes up with the square of speed. That's why headwinds and tailwinds play a big role in mileage. Towing at 60 doesn't create twice the drag as towing at 30, it's 4 times as much. Towing at 60 with a 20 mph tailwind creates the same air drag as towing at 40... But turn around and go the other way, and it's the same as towing at 80. So, the air drag has quadrupled while towing at the same speed.

Have fun...
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Old 09-12-2015, 09:48 AM   #9
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The extra height and width will make a difference. Slightly more drag so less fuel mileage. Later RJD
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Old 09-12-2015, 10:45 AM   #10
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All RV's are like pushing a wall against the wind.

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