Fuelly mileage of the big three diesels
It appears the new 10 speed in the Fords made a significant impact in catching up with the Cummins fuel mileage in the 2500's. Although it is still too little info in all of the new 2020 models to te...
Forum Discussion
Dadoffourgirls wrote:
I was towing between MI and Kansas. 10 mpg. I purchased the Def at the truck pumps at $2.99, and most have used slightly more than your calculation. I was surprised by the amount of DEF I used, but followed the messages.
Well then of course. The cost per mile of DEF/diesel will go up when towing just as it would with a gas truck. My calculations are based on average fuel economy numbers on Fuelly. However, if you have a GM diesel, then you likely use more DEF simply because they get the worst fuel mileage of all three according to the Fuelly images in my initial post. The more fuel the truck uses, the more DEF it uses.
Doing the math at 10 mpg, your DEF usage should be $.00598 per mile at the industry standard of 50:1.
