I am 100% sure the tune isn't giving you bad gas mileage, especially with such a pitifully small sample size (20 miles). I was getting worse gas mileage right after I tuned my car as well. It will pass.
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Performance Mods: Eibach Pro Kit Springs, Eibach Sway Bars, KONI SA Dampers, M Perf Rear Brakes, Dinan Free Flow Exhaust, MHD Stage 2
Retrofit: Reversing Camera, Rear PDC, Front PDC, NBT Evo
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