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

submitted 5 months ago by pelletbucket@lemm.ee to c/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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[-] FiskFisk33@startrek.website 32 points 5 months ago* (last edited 5 months ago)

E10 has an energy density of 108,608 BTU/gal and E15 has an energy density of 106,814 BTU/gal.

source: http://www.airimprovement.com/reports/national-e15-analysis-final.pdf

This gives us tha the 88 octane has 106.8/108.6 ≈ 0.983 times the energy density of the 87.

1-0.983 = 0.017

The correct number is that the 88 needs to be 1.7% cheaper than 87 to give equivalent distance per dollar.

LLMs are fantastic tech, good at many things. Math is not one of those things.

this post was submitted on 01 Jul 2024

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