My over all mileage is around 12.5, the HP rating of 300hp is way optimistic. Buy a V10 if you want a gas engine and probably won't get any worse mileage.
I have the 5.4 3.73 rearend 4x4 crew cab w 20"wheels. With 1500 miles I am getting 13.6 mpg mixed driving. I wished I would have gotten the V-10. The 5.4 does not seem to have enough power to move this size truck. The 4.10 rearend may have been better but its mine now. Other than that , I love this truck.
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