Originally Posted by cchsbuzz19

I only get 11.7 mpg and I've done everything I can think of to try and get that up. I got a K&N intake Gibson extreme dual exhaust Bosch O2 sensors all around new spark plugs spark plug wires I use the castrol gtx for engines with 75,000 and over and I use seafoam every 3000 miles. I do run 31x10.50 tires but those come stock on the newer fx4 rangers. I got the 3.73 gears and I,m getting ready to change the fluid. I might just get the worst mpg for a 4.0 on r-f