V6 DBL Cab PreRunner gas mileage

Ok. I put BFG KO2 265x75x16 all around, mounted on TRD pro wheels back in January (I had same size BFG All Terrains on prior). I immediately noticed the weight of the tires on the way home. Prior to the wheel/tire swap, I was getting 18-20 combined mpg (mostly highway). With the new tires and wheels, I dropped to 16 to 17 mpg.

I got lazy and didn't check the mileage again for a while but when I did last month, the mpg's went up to 18 (I'm assuming the ECU reset and compensated for the heavier tires?).

I had a Jack In The Box antennae ball on the antennae and kept noticing the antennae was really bent from the drag the ball caused so I took it off. Since removing the ball, my mileage has increased to 18.8 in the last 3 tanks. Weird that a foam ball would cause that much of a drag on mpg's.

 

Dirty truck will also drop the mileage .02 mpg. Keep it waxed and shiny for good mileage.

 

Along with fresh lubricants in the engine, transmission, and differential, synthetic preferably for the best mileage.