Originally Posted by ben47
Why do you say an ECU reprogram requires 100 octane fuel and live with lower mileage? I have the Upsolute reflash
and my car runs just fine on 91 octane. The mileage has stayed the same.
Well usually after a reflash the timing is made a little more aggressive, and requires higher octane, but you already knew that.
Doesn't Upsolute has various stages of reflashed mapping, so I guess you can get by on 91 gas? This is another issue I have with these companies that remap our ECU's, we never really know what they did if at all anything. Anychance you can get a print out of the cells and compare before and after?