Still to this day...most people don't understand gasoline and burn rates - your car is designed to run on 87 - if you run any higher rating than that you are throwing money away - for decades people have misunderstood how gasoline burns and what octane readings are and what they mean especially in relation to gasoline and its burn rate. If you put a fuel in that has a higher octane number/rating, not only are you wasting your money but the engine will have less power - you want the FASTEST burning fuel you can get away with not the slowest - my grandfather used to do the same thing for decades and I finally got around to telling him "Grandpa...this thing is designed to run on 87...why are you wasting money on "premium" ... so he finally realized after I explained what you see in this blog and he stopped doing that and started saving money - what happens is people get fixated on the word/term "premuim" and back in the old days...there was some merit to the "quality" and cleanliness of the fuel, plus most everything in the old days was high compression so higher octane fuels were necessary - but in modern day...the three grades are basically identical fuels with identical cleanliness (required by auto manufacturers and the feds) and then compounds are added to change the burn rate/octane rating.