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I started getting poorer gas mileage once I installed the header and tune. You have to realize the OEM tune was designed to hit fuel economy targets first (don't forget CAFE) and then safely maximize power at the given fuel economy. The OFT tunes unlock additional power without regard for fuel economy.
There's a thread on here where people were modifying their OFT tunes to try and extract better economy while keeping some of the gains if that's important to you. But remember, you're fighting basic physics - an ICE makes power by igniting fuel, so all else being equal it makes more power when more fuel is used, and vice versa.
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