[FED 387]

supposedly the OEM air induction system(filter ,tubes ,air cleaner box) is more than adequate to handle the 8.1 it's the opening for the throttle body that is the restriction---the cold air actually makes the engine WANT more fuel so with an increase in fuel consumption AND power while you get a decrease in MPG. Second use lots of synthetic fluids in the rear , trans if you can and engine oil.---third put a tonneau cover or a cap on the bed to help smooth out the air flow over that open bend---maybe put a chin spoiler under the front bumper to help smooth that area out-----then change to a 3:73 rear from that 4:10 to cut down on RPM 's at cruising speed --and finally maybe either a nose cone on the front of the trailer and or a spoiler on the top of that cap to move the air up and over that flat front of the trailer---FED 387