Duramax Towing Mileage

[The Engineer]

I have a 24 ft (28 ft OAL) tandem axle bumper tow enclosed race car trailer that weighs about 8,000 pounds loaded up. My Duramax with Allison 6-spd transmission is a low mileage 2013, 2500 HD, 4WD and crew cab.

Typically, I'm getting about 10.5 MPG at best and sometimes only around 9 MPG for some reason. And, I'm "maliciously checking" the mileage with my calculator each time I fill-up. I'm thinking it should be doing better than 10.5 MPG towing the trailer.

Also, every time I ask someone else with a Duramax about their towing mileage, they always tell me what they "think" they are getting, but they haven't actually calculated their mileage. And that drives me crazy.

So, what mileage should I be getting towing this trailer?

 

[clrussell]

Stock emissions? Mileage sounds right on a stock truck. Those trailers aren't fuel mileage friendly


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[The Engineer]

Stock emissions? Mileage sounds right on a stock truck. Those trailers aren't fuel mileage friendly


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Yes, the 2500 HD is completely stock!

 

[Pure Diesel]

Your pulling a brick.
That front end, of the trailer, is just a big wall for the air to hit after coming over the truck.
Do you pull it a lot? Does the trailer company or someone make an aftermarket bubble for the front end?

 

[Mpsoldier]

My 02 with 24' enclosed with 7 motorcycles, from Ct to FL gets 11.3mpg doing 80mph. sometimes i have one in the bed also usually with 3 or 4 people in the truck plus gear. empty i get 19 mpg all day. With my 20' deck-over I get about 15mpg loaded and unloaded. Willis tuning

 

[THEFERMANATOR]

Have one thats 25 feet long, but is a bit over 10 feet high(8 foot door), and I get right at 11.5-12 towing it at 70. The other one is 16 feet long, right around 9.5-10 feet tall(7' 2" door), and I get right around 14-15 towing it at 70. And my 32' HOLIDAY RAMBLER bumper pull travel trailer gets right around 12-12.5 towing at 65-70.