on my 07 crew 2wd i got 23.5mpg with stock tires, put pro 4x wheels/tires and got 22 at best... current 04 kc 2wd bigtow i get on avg 16 around town and 20.8mpg on highway at best.. 18.3 in the mountains on hwy
i run mobil1 synthetic(eng and axle), keep up with my trans drain/fills,tires are mich 275/65/18, built cold air intake and most importantly throttle control... and dont use cruise control...