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It's a bit behind, I haven't done any testing since installing the exhaust system, but this should give you an idea of the potential results. Each truck responds differently to mods.
I get 10 to 14 in the winter on straight #1 and 13 to 15 on the winter blend. Spring summer and fall I get 17 to 21 on #2.
I've got the down pipe, 6637 intake, 40hp tow chip, 4x4, F350, crewcab, 10' service box, and at least 1000 lbs of tools and crap in the back at all times.
lol ok so u got some weight in the bed all the time butt that will not make much difference they can tow way more. I am looking to buy one but i want to know what people r getting for mpg. Any one here have dpi (digital propane injection) i heard that it give u more complete burn an increases your mpg by a lot an gives u a boost of power?