newish here
Retired Senior Admin
Expert Gearhead
Joined: May 2006
Posts: 29,661
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From: Sheboygan Wisconsin
Lower octane fuel can be used, however, it will retard the timing a fair amount. You loose about 5hp per degree of timing. With less power you will have less mileage. In the end, the higher price of 93 is off set with a few more miles per gallon.
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