this post was submitted on 01 Jul 2024
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That cheaper 88 octane fuel is a blend of 85% unleaded gasoline and 15% ethanol. It's also known as E15 fuel.
The ethanol is an oxygenate: it adds oxygen atoms to the fuel mix so the fuel burns more completely. That's good for vehicle emissions. However, the ethanol is less energy dense than gasoline so you will get slightly worse mileage.
https://www.motortrend.com/news/what-is-e15-gasoline-pros-cons/
https://www.cleveland.com/news/2023/05/cheap-gas-lower-mpg-are-unleaded-88-and-flex-fuel-more-expensive-in-the-long-run-saving-you-money.html
okay so I had AI do the math for me.
"I drove a screw with a hammer"
cool story
source: http://www.airimprovement.com/reports/national-e15-analysis-final.pdf
This gives us tha the 88 octane has 106.8/108.6 โ 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.
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.
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.