I definitely agree with the above posters saying that it's prolly you or the way you drive that changed since the mods. It makes sense that with a new tune and better sounding exhaust you would give it more gas than normal.
A good test would be cruising on the highway, not in town where driving habits and traffic can greatly affect the mileage. How can you be sure that you didn't hit extra traffic or a few more lights? At least on the highway cruising at 65mph is the same everyday.
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