I bought the same truck only 4x4 instead. At 2k miles I dumped the ff and replaced with m1 0w20ep and a acdelcp pf63 filter. I have 6k on the truck now and it's been flawless. Made one trip from southeast louisiana to south indiana, on the return trip I ran the truck at the 98mph speed limiter for a good 200miles or so and then 85 the rest of the way. Mpg on that trip was about 17.8. My truck actually came from Houston as apart of a dealer trade