why do a bunch of gas stations have 88 octane cheaper than 87?
I figured it was a marketing gimmick to get you to buy 88 and then they would finally raise the price, but it's been years. are they adding extra ethanol or something?
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Octane is a measure of how prone to knocking the fuel is, not energy.
Knocking is premature combustion, I.e. why lead used to be added.