00 7.3 ford witha 6 speed.. DIY intake setup, deleted muffler out this side... and a cheapo superships flash tuner.. I get consistantly 17.5 with mixed in/out of town.. got around 13/14 cruising the interstate with 2 sleds on the deck, bed and cab totally full of crap and 2 place sled/utility trailer loaded down, I had enough crap stuffed in it to squat a 250 pretty damn far... I love it.. and its a LOT cheaper then a freakin new truck.