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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.
I dunno, it doesn’t seem to overstate its case
It also uses sources such as Vice and the BBC
I wouldn’t call it a high quality article, but I also wouldn’t call it factually incorrect.