ok i just drove 3600km from ont to ab canada now my truck got 18 at best be for o left i had about 2000p in the box(i moved) and going thought northen ont and then on the plans i avg 26.7 now i can best on my truck and till get 20 or 22 around town with 225,000km it workes good but my truck ran for 64 hours and then i shout it off and went back to it the tail pipe had white ressen on it that staded on for 2 weeks it was like glass coated any ideas my nexted it a 4wd on it.