Quote:
Originally Posted by larkdog
How about filling half the tank with 93 and half with 87 or 89(mid where I am)? Anyone tried?
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As long as the final octane rating comes out to 91 or greater you will be fine, but it seems like a waste of time.
91 octane is considered by all automakers to be premium fuel nowadays. If a car calls for premium it's designed for 91. I'm not sure why we still have 93 on the east coast.