Quote:
Originally Posted by jesse.rizzo
Just to further complicate things, the octane rating on the pump is the minimum octane for that grade. there is no rule about them selling a higher octane than stated. In states where ethanol must be blended in 5 or 10 percent with regular gasoline, the "regular" might be the same octane as the mid grade or premium.
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Bingo!
Local tv station did a report on this about a year ago. They took samples of 87 89 and 91 octane from a number of local gas stations to a lab to be analized. They found all the samples tested between 90-92 octane with anywhere between 10-15% ethanol content. All the gasoline came from the same refinery and the only variation was the ammount of ethanol mixed in.