Fuel mileage on 6.6 duramax & 6.6 gas!

niomarvin83 · October 21, 2020

I have a 2500 6.0L and a diesel which I buy with wallworktrucks so I see the pros and cons of both. The diesel gets roughly 4-5mpg better and is comfortable towing close to double the weight. That being said the 6.0L can still tow over 10000lbs which is more than enough for most jobs. Both of mine have about 200000km and have been mostly trouble free but repairs on the diesel are more expensive. It also depends how long you intend to keep the truck, the diesel engines average time before a rebuild is 600000km so if taken care of it will last for ever. Finally the diesels extra weight means a lower payload. I love both of my trucks so it would be hard to recommend one, it all depends on your personal needs and preference.

Arkangel · October 27, 2020

What MPH are you folks driving to achieve 20mpg+ on the highway? Im doing 75-80 and avg is around 16-17

2020 Duramax AT4

Edited October 27, 2020 by Arkangel

clk7711 · October 27, 2020

16 hours ago, Arkangel said:

What MPH are you folks driving to achieve 20mpg+ on the highway? Im doing 75-80 and avg is around 16-17

2020 Duramax AT4

You're not the only one. I get 16mpg driving the same speeds. 2020 AT4 3500 SRW.