[piecesparts]

It did not affect my mileage, I was getting 19 MPG with mixed driving, already. I see the fuel economy computer kick up numbers like 23 and 24 MPG at times, but I have not put the truck on the highway for a really long trip to see if it performs that way. I have seen 21+ on just highway driving from my home to Wichita, but I can't keep the foot out of the pedal. As for numbers, I am not running this at the track, so I don't have numbers. The shift is very crisp and the acceleration is great. The top speed cut off is NO LONGER at 98 MPH---we put a one in front of the 98 and there is no problem passing the old fuel cut off speed. This hot summer heat is not helping a lot either.