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I have always used 93 octane. I also try to buy gas without ethanol. I found a Mobil station in Wisconsin that has 93 octane and 0% ethanol. They charge a little extra, but the prices are still lower than the Chicago area gas prices. Plus I get slightly better gas mileage. The station is on my weekly return route back home.
Don't forget our engines are very high compression ratios...I think 11:1. So, high octane is pretty critical. The engine could go "booom"! Not likely, but it can happen. Just not worth the risk.
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