What Gas?

Old 02-17-2015, 09:34 AM
Audi Forum - Posts like an A1
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Join Date: Feb 2015
Location: Calgary
Posts: 28
Adam Stasiak is on a distinguished road
Default What Gas?

I was always using premium gas - 91 Octane min- and recently I bought mid grade 89 Octane gasoline At ESSO. To my surprise the car runs better on mid grade than on premium. There is a big difference in engine responsiveness and acceleration. I also tested mid grade at Husky with the same result. Why 89 Octane is better than Premium?
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