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why do a bunch of gas stations have 88 octane cheaper than 87? (lemm.ee)

submitted 4 months ago by [email protected] to c/[email protected]

42 comments fedilink hide all child comments

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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[–] [email protected] 3 points 4 months ago* (last edited 4 months ago) (1 children)

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.

[–] [email protected] 3 points 4 months ago

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