Originally Posted by
Riderman
I have never even come close to 18MPG with a 300 I6. I've had several rebuilt ones and even a one year old truck with one. 3 on the tree or 4spd tranny, they all would barely break 12mpg, downhill, with the wind at it's back.
That's not been my experience, even an old tired I6 can usually muster 14-15mpg.