2012 Reg Cab 5spd 2wd w/31x10.50R15 tires MPG

Just picked up a 2012 Reg Cab 5spd 2wd truck with a small lift (not sure how much, but the tires don't rub at all) and new 31" Pro Comp mud terrain tires. 12,000 miles on the odometer. I am seeing a consistent 18.5 mpg with mostly city driving and a light foot. This MPG figure IS adjusted 10% for the larger tires. I assume this is about right for running 31" tires? I plan on going down to 30" all terrains and or a narrower tire when these wear out, so I am hoping that with help bump up 1-2 mpgs? Your thoughts?

 

Buy a prius if you want high MPG

 

Not looking for high MPG. Can't stand Priuses anyways! Ugly as hell... 31" mud tires are overkill in my opinion, so was curious if I would see a little bump in MPGs going down to 30" ATs in my poser 4x4... hehe

 

HAHA the narrower portion would help out alot more than the height aspect within reason.

 

Good to know. Thanks!