[TwoFiftyShifter]

Its that motor I think. At 2700 it is spinning a bit fast for economy, but its requiring very little throttle to push the truck. At 2000, its purring nicely but isnt making the same power so its working a bit harder. I bet with a 307 V8 and that T5, you would clear 15mpg. That said, 15 isn't terrible.

If you did a before and after at 75mph, you would see an increase I bet.