That is nothing but BULLSH!T!!!! First of all you may get 60hp out of custom tunes but I dout it but there is no way you are gona get 60 hp if any out of that. And as far as 4-7 mpg increase there is no possible way. That is a rip off that is not gona do anything near to what they claim. Don't waste your money on that and buy something that will help your truck like a tank of gas or something.
2004 F150 XLT 5.4 4x4 3:55-Edge Evolution-Flowmaster 40 series si/do-K and N drop in airfilter-Gotts Mod-Kobalt Toolbox-Auto spring 2 inch leveling kit