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the higher octane protects against detonation better, You could probably get away with it if you live in Denver but I would not do it at sea level. You might find a cheap octane booster that you could use - of course you could buy 3 ea 5 gallon Jerry cans, fill them with 15 gallons and sell to the neighbor at a reduced price then use that money to buy premium. If you have more than one car and it takes regular then have her drive it to work instead.
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