I drive 05 f150 4.2L and am getting terrible gas milage, im looking for some performance upgrades, ive only found a superchip programmer but im not sure how well that will work. i need help. thanks

 

what do you mean terrible? Like 5 mpg or 15 mpg?

 

like 11.5 mpg

 

any CEL codes?

 

Plugs and fuel filter should help out.

 

Is this a 100% stock truck? if so, you have some major issues.

How many miles on it and what is its maintenance history?

 

Oil change. All filters (Oil, Air, Fuel). Spark Plugs. Intake and exhaust. That should be a good start

 

No codes, its been maintained, 58000miles, and the filters and oil are fresh.

 

yea 11 on a stock truck is horrible!! im runnin 305/70/17s with 4.56s and i get at best 17!!

 

had a problem with making good gas mileage at one point and realized i was losing a little power, i changed everything i knew to be related to such a problem. It was the park brake clicked in about three clicks down, release cable was faulty so i changed it and my gas mileage went from 13- 18.

 

also how heavy is your foot? LOL