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why do a bunch of gas stations have 88 octane cheaper than 87?

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pelletbucket@lemm.ee
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asklemmy@lemmy.ml
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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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Gladaed@feddit.org
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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.

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pelletbucket@lemm.eeOP
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holy fuck you’re right. I always knew that higher quality fuels reduced knocking, but I thought it was a side effect of the fuel being more pure or something. I haven’t really put any thought into this since I was a kid

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