I just put on a new Leo Vince underbody exhaust with PCIII and custom dyno tuned map. My tank range went down noticeably. I hit half tank at 88 miles which was shocking to me. Last fuel indicator dot started blinking at 170 miles. I figure with probably 30 miles left at that point I would be dry near the 200 mile mark. I love the improvement in performance, it feels great! But I need help making the loss in mileage ok in my head. The tuner was like "your'e getting almost 200 miles still, what's the problem?" If you are running a PCIII or V what did it do to your mileage? The dyno run shows the map I came to the tune with (red line) and the improved custom map I have now plus optimum air fuel which he called spot on.
91.1 KB Views: 520