It’s not necessarily the case.
E85 ethanol (85%) is $2.39 a gallon in the US average:
https://e85prices.com/
That’s 64¢ a liter for metric users.
And that price includes taxes and fees for road vehicles.
It largely depends on how it’s packed, distributed, advertised, regulated, and taxed.
It’s not easy to get a liter/quart of isopropyl alcohol here for under $1.
It’s not easy to get a gallon (3.71 liters) for $2-$3.
Usually a small bottle of isopropyl is $2-$3.
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