[Matt]

so lets get a list of hand calculated no bs mileage for your truck with given mods ...

2006 1/2 ton 4x4
5.7 stock
flowmaster dumped exhaust
3.92 gears
7" suspension lift
37x13.50x20 Toyo Mts

9.8-10.5 mpg 85% town driving i noticed a huge drop with the 37's vs the 35's there is a big weight difference between them