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Message: [QUOTE="Ronin, post: 274613, member: 2612"] I'm a "[URL="http://www.fuelly.com/"]Fuelly[/URL]" nerd which takes my obsession with mileage to a whole new level! At just over 22K miles (I bought the truck brand new) my best ever tank was 17.4 MPG with IDP XStreet. Bone stock the best mileage I ever got was 16.4 MPG. Those are the extremes on the high end. I do quite a bit of towing, and with my H&H car carrier trailer set up for 4 bikes (with tools. etc.) at just under 8K pounds on a 3K mile trip I went from 9.1 to 11.3 MPG per tank, about 95%+ of that was highway. Right now my overall average mileage is right at 13.0 MPG exactly. Considering I had an '07 Cadillac Escalade ESV prior to this truck, that's a significant increase. On the same tow trip my Escalade's MPG would drop to under 7 MPG and I could barely drive 3 hours straight without being on fumes and ran out of gas twice (always have fuel cans in the trailer though, but no one likes topping off the side of I-80 with people flying by you doing 80!). I'm in the process of lowering/leveling (4800# springs and removing the rear block) my truck, and adding a BakFlip F1 tonneau cover and tool box. I did an AirDog 165 GPH/10 PSI fixed (I think?) on my buddy's F350 and I'm going to do one on mine along with a Titan XL 51-gallon fuel tank shortly. I'm hoping ALL of that will push me close to 15 MPG over the next 22K miles. It doesn't sound like much, put percentage wise, that's pretty huge. I don't think that 14 MPG will be a stretch at all, 15 would be sweet and anything above and beyond that would be icing on the cake. With the Titan tank I could possibly run over 900 miles on a tank provided I'm not towing and driving like there's a bald eagle egg under the skinny pedal... I didn't buy a diesel for the mileage, but I certainly don't mind getting the best mileage possible! [/QUOTE]