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The different "grades" of gasoline are misleading anyway. Now that up to 10% ethanol is required nation wide (the pump doesn't have to say if it does contain ethanol), and since ethanol raises the octane of gas, the "regular" is often the same octane as the "premium". Some places have started charging the same price for all grades.
But, unfortunately, as you said, the only way to know for sure is testing.
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