Have you noticed any change in gas mileage since the tune? I'd actually expect it to be a bit better, depending on your driving style. It can't be much worse...I'm getting 13.3 avg, which is actually better than the 6 that was on the gauge when I picked it up (I have a pic of this). I actually get better gas mileage in my Aston Martin...and that's supercharged with over 600 hp!

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2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red