I use 89 everytime I fill up. Reason being is I had a Prius before my Maverick and at 250k+ miles started getting a lot of carbon build up that eventually killed the engine. Talked to my mechanic and it seems to come down to the fact that I was using the cheapest gas I could find. Since I fully intend to keep the Maverick 250+k miles is worth the extra 50¢ a gallon to me
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