Forum Discussion

Grodyman's avatar
Grodyman
Explorer
Jul 12, 2020

Diesel Towing MPG With Ultralight Trailer

Anybody have any idea what a late model 2500 series DIESEL truck pulling a mini trailer 3500lbs max trailer weight would be?

My 2017 3.5 Ecoboost gets about 20 mpg highway empty. It gets 7-9 mpg towing an untralight 4500lb trailer (Passport 153ML), which is terrible (23 gallon fuel tank).

Trying to decide what the best retirement truck is, where I will no longer have a long commute with a lot of empty miles like I do now.

Gman
  • jdc1's avatar
    jdc1
    Explorer II
    My 2001 Dodge Ram 2500 5.9 diesel saw 19mpg empty, 13 towing 7,500 lbs.
    My 1997 F250 460 gasser got 7-8mpg empty. Forget towing....too expensive.
    My 2000 F350 7.3 diesel sees 15-16mpg empty, 12.5 towing my 8,000 pound 5th 5th wheel..
  • About 30% better mileage with a diesel all things the same. I got 9-10 with my gas and 12 with my diesel. Same trailer, speed, weight.....bla, bla, bla....
  • My neighbor yesterday was telling me how foolish it was to drive a diesel truck as we were riding down so he could buy a $ 400 ice chest . I guess we all just need to do what feels good !
  • A lot of the extra cost to buy a diesel will be recouped when you sell or trade . A used 5 year old diesel will bring 4 or 5 thousand more than a gas truck , check comparable trucks on Blue book .
  • My Ram 2500 will get 16 MPG at 62 MPH pulling a 4,000 lb TT .Not towing we get 19 or 20 . Any speed above 65 MPH towing will drop it to 13 MPG .
  • Unless you are towing 50k miles a year the cost of the diesel will never be recouped in fuel savings. I think that Eco is probably about the perfect setup for you trailer.
  • I expect 12mpg. I get 7-8mpg towing 6500 pound TT with 6.0L gas. My buddy has pulled my trailer with 2012 GM 1-ton diesel and get 11-12 @ same speeds.
  • Cost will all go down if you just cross a state line.
    Otherwise, slow down, speed hurts mileage, and if you are retiring, you shouldn't be in a hurry, so slow down and enjoy the trip.
    Your Eco Boost with a 10 speed is one of the more miserly choices short of getting a half ton with a diesel.
  • If you tow in tow-haul mode you should see about the same mileage as other towing in that mode, no matter the weight of the trailer.
  • Frontal area of the RV contribute lots of wind resistance and kills your mileage