I per example don’t see it that way, I think 87 Octan gas with Ethanol is inferior to 91/93 without it.
From searching several auto fuel articles:
Most higher-octane auto fuels have MORE ethanol in them, unless it is specified ethanol FREE. This is because ethanol is a cheap way to increase octane.
MUCH Older vehicles may have issues with ethanol in the gas. But newer cars that specify 87 octane gas don't, as they have changed the hoses, etc., that had issues with ethanol.
There is little to no benefit in using a higher-octane gas than what is specified for your vehicle, under normal driving conditions.
Examples of ethanol gas vs. no ethanol:
Midgrade and premium fuels, such as 91 or 93 octanes, are simply 10% ethanol mixed with gasoline, along with other petroleum compounds.
Some higher-octane auto fuels will advertise ethanol free. One example is Shell V-Power NITRO+ Premium Gasoline advertises ethanol free.
Wawa's in my area has ethanol free pumps, along with 3 octane levels from regular 87 to higher octane, which all have less than 10% ethanol added.