If your car calls for regular and you're putting premium in it--you can actually be damaging your engine for the following reasons:
1) you don't have enough compression and ignition timing to completely burn the gas
2) with incomplete combustion there will be deposits of carbon in your valve train
3) this will be very evident , especially if you do not drive at highway speeds
4) with incomplete combustion you're all jeopardizing the catalytic convertor and O2 sensor
Use the gas that your car is designed to run on
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