Quote:
Originally Posted by Texas Coyote
Regular grade fuel only meets the minimum octane requirements that are needed for a Fit not to ping..... No where in the owners manual is it recommended to use 87 octane fuel, it just meets the minimum requirements only .... It has been proven that the ECU will adjust to to benefit from higher octane fuel.....My fuel mileage figures convinced me and it isn't costing me more than $1.00 per tank to use premium and, there is still an increase in performance and no need for additives to clean the injectors and possible carbon accumulations in the combustion chambers from the lesser amount of ignition advance.
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It is all in your mind that you're getting better gas mileage because if you started using 87 from the start, you will be getting the same gas mileage you are getting now. You're just giving the oil companies extra profit for a car that doesn't require premium gas. The difference is about 3+ dollars every fill and that is a lot of money every year for people that fills their tank often. Higher octane gas was made for cars with higher compression to avoid engine knocking.