Often truck engines are set up with small passages in the intake and head (higher air velocity adds low end torque). Additionally, the rear end gearing is not MPG-friendly.
It is quite possible you could spend a sizeable amount on a fuel injection system and still have a truck which obtains 12 MPG.
Passenger engine heads, intake, and 4-barrel carb MIGHT help a little on fuel economy, and WOULD help performance. An overdrive transmission should help both.
In any event, should you do the math, probably nothing you do will sufficiently increase the fuel economy enough to pay for the modifications.
Jon.
Last edited by carbking; 01/23/2011 12:42 AM.
