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You do realize that the model T and A both were designed and ran on ethanol right. This was before close loop O2 ECU control and direct gas injection with turbos. Brazil fuels their cars with E100 as in pure ethanol they run just fine. They even use HE95 as in hydrous ethanol with 5% water in it as a state certified fuel. Here again they run cars in the tropics with those fuels just fine Reed vapor pressure is none issue as long as you have a positive sealing fuel cap. NASCAR uses ethanol as their official fuel as does F1 having switched from methanol before. Ethanol is not near as toxic in a spill or crash as methanol. Most if not all cars with a turbo newer than 2001 will benefit from the high octane of ethanol it’s 116/123 in pure form plus it’s huge latent heat capacity which with direct injection and boost cools the charge just like alcohol injection did during WWII for 1500 hp plus fighter engines under boost at take off. People add alcohol injection systems to boosted sports car for this very reason as an aftermarket upgrade it can add 100+ hp to an engine before knock sets in. It’s irrational behavior to not see the benefits to some alcohol in fuel the science is solid on it plus the decrease on pollution due to the OH radical in the molecule that adds oxygen to keep particulates, carbon monoxide levels low. All the “issues” with ethanol were solved decades ago only boomers clinging to old ideas and hear say see a goblin in ethanol. Modern engines burn it with ease and for most it benefits them. Small engines with carburetor with 1900s level of technology and cork floats and seals because the Chinese parts maker wanted to save a few penny’s is in no way representative of what a modern as in less than 10 year old engine is made to run on.

The part of Virginia that I live in is an EPA non-attainment area. Gasoline is required to be oxygenated. They used to use MTBE as the oxygenate, until the oil companies stopped using MTBE due to liability.

They started using ethanol as the oxygenate.

The amount of ignorance about E10 was astonishing. People were claiming it would destroy your engine...despite it having been sold in some parts of the USA since at least the early 80s, and automakers issuing TSBs dating back to the 80s saying that their vehicles are DESIGNED for E10.

I use E10 in my riding mower. I don’t drain the fuel in the fall, I just park it inside my garage (so it doesn’t get rained on, so water can’t get into the fuel system) and there’s no problem starting it in the spring.

You are only sharing half the true picture, you have completely omitted the difference in compression ratios between back then and now. At current compression ratios a “naturally aspirated” engine cannot run over 10% without mechanically raising the compression ratio. Turbocharged or supercharged engines at current compression ratios you might be able to “get away with”, but not naturally aspirated engines. Current ratios are commonly 7.5 to 1. We would have to bring ratios up to 10 to 1 or 12 to 1 to run a higher alcohol content than 10% without turbo or supercharging. Alcohol race engines can be 14 to 1 compression + supercharger boost.