I literally got through roughly 1/4 tank a gas a day. I just filled up Tuesday night and I've used a 1/4 already. I've changed my oil, clean my MAF sensor and throttle body, running a race 93 tune, cleaned my BBK filter, and changed my serpentine belt. What else can I do to improve my MPG? Someone told me Mustangs are notorious for bad gas mileage and the more I mod it, the worse it'll get?