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Old 08-15-2012, 08:47 AM   #451
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Update for first tank of 89 vs 87 in my blind test in my wife's Focus.

Result .... no change in mileage whatsoever. Same exact numbers.

I filled up yesterday and 89 was 22 cents more per gallon compared to 10 cents per gallon more when I started the test. I put in regular.

Sorry guys ... I don't see a difference in either performance OR mileage with higher octane gasoline. I'll try it again though when gas prices get lower and the difference between the grades is about a dime like it should be.

Maybe you gotta do it for more than one tank for the car to 'learn' about it's new higher octane fuel.

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