Originally Posted by kylesvt720
If you guys want this settled. Get a car, and a dyno. Run it almost to E, fill with a gallon or two of regular. Dyno it, then drive it around until it's about to be empty, fill with Premium, re dyno, (same day) and see if there is a gain.
That wouldn't work, you'd have to reset the ecu and let it adjust. Maybe a tank of regular, reset the ecu, and then a tank of premium.