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?

      • FiskFisk33@startrek.website
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        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.

        • pelletbucket@lemm.eeOP
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          5 months ago

          yeah that’s why I labeled it as ai. like I can figure it out as a word problem to tell somebody, but I can’t figure out the math from there

          I didn’t feed it the energy density of e10 vs. e15, I just told it that ethanol was 30% less efficient, and gave it the percentages.

          • TheGalacticVoid@lemm.ee
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            5 months ago

            The AI does nothing with the percentages because it is an LLM, not an AI designed for math. All an LLM does is take a small number of words and turn them into a different set of words. It does not use your small set of words to run any formulas on your behalf.