Upgraded to the RIPP coil packs on my 3rd Gen Tacoma. Also, have K&N Cold Air intake with a Flowmaster FX exhaust. Having increased my tire size from 265/70r/17 to a 285/70r/17, and the Coil packs coupled with the cold air intake and exhaust adds round-a-bout 50+ HP. So far I've been able to maintain 18+ MPG with the larger tires how ever, Interstate travel or areas with speed limits 70 MPH and up, tends to burn fuel up quicker with RPMs sticking around 3000 between 5th and 6th Gear. I've read t...