Quote:
Originally Posted by jesse.rizzo
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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I will NOT put 87 octane 10% ethanol into my SRT-4 and boost away. i WILL put 91 in. I know ethanol is >100 octane, but that is ethanol, not a blend. We do not have that in California, 87 out here is 87. null point. Don't use it in your performance car blindly. "E-85 regular" sold in places ive never even visited is a different argument.
Octane number is a rating of the detonation properties of the fuel. Gasoline has many types of fluids in it, all with slightly different octane numbers.