Ok I have a 08 6.4
On 37s with a bds 9"
Now I know lifting the truck would hurt Mpgs
But my neighbor has a 03 7.3 with 42s and a 12" lift and he can get 22 highway and about 16-17 city
Does not having it dpf deleted really drop my Mpgs that much?
I am new to diesels completely.
I had...