I know the custom tune on mine with Straights and a Gott's mod really woke up. They can program it to pull more air since it doesnt have the trumpet in the way anymore. If you buy a tune always get the tow tune, Performance tunes are for that exactly, high speed performance that a 4x4 dont really need....
Most people use 87, i got a 89 Tow Tune because i wanna be the man in the middle and have a slightly better burning gas that doesnt cost a fortune,
Play with your torque converter lock settings to get better in town mpg
This means at -xx mph or whichever you select, it will lock up at a slower speed, to make up for the bigger tires. So, Essentially you can do 40mph at 1100 rpm.
MPG Gains are really just from transmission tuning mostly. But i feed it more fuel, more air, and straight pipes, and get terrible gas mileage lmfao, i may can pull 14-15 on highway sometimes. Usually 10-12 in town
2004 F150, Supercrew Lariat 4x4 | 5.4 3v 209k
K&N Filter | Edge Evolution | Mesh Grill | 3' Leveling kit
VX True Dual Exhaust | 33" BFGoodRich All Terrain T/A KO
Cattleman HD Front Replacement | 22" LED Lightbar