M109 fuel economy

[Z71]

I have a non-turbo 109 and I get 8ish. I would try slowing down too.

That's pretty much in line with what I would see at lower speeds I think. I have not used this truck much, I only put about 3,000 miles on it over several years.

 

[gimpyrobb]

I saw you were looking at getting some tires, taller meats should help on the mpg vs mph.
I'd look for some 1100s.