Never done this before, but just for your information you should know that by law all stations post the octane rating on their gas. Most regular in Idaho Falls is 85 octane for regular unleaded at $4.09. Most sinclair stations post an octane rating of 88 on regular unleaded and anyone will get better mileage on any higher octane fuel, as it produces more energy.
Here are the charts:
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Never done this before, but just for your information you should know that by law all stations post the octane rating on their gas. Most regular in Idaho Falls is 85 octane for regular unleaded at $4.09. Most sinclair stations post an octane rating of 88 on regular unleaded and anyone will get better mileage on any higher octane fuel, as it produces more energy.
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