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OMG same here...i filled up today and i also have an average of 21.5 MPG...i decided to go with middle grade gas this time....the first or two times (cant remember how many times i filled gas in my car )i filled up i put supreme...what about u?
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No reason to use supreme on motors not designed for it, you will actually not get any better performance and can possibly harm your motor. Supreme (i.e. 93 octane and above) is for high compression high performance engines only.
I wouldn't use anything higher then what the manual states..
Brad