I definitely noted an improvement in acceleration from a stop and in passing. I always use 93 octane fuel but I did fuel a couple times at a station that uses the same hose for Premium and 87 and didn't note any problems. I have heard no pinging and have had no problems. BUT NOTE...I do not drive my car to the limits, I just enjoy an occasional quick start and use the acceleration to pass Grandma and Grandpa. :-)