Correct. Gasohol was the early name for E10 and, yes, E10 started, and was heavily promoted, the the Midwest corn belt. E0 here where I live is called marine gas and only available at Parker's gas stations. The name E10 came later when the EPA started regulating the percentage of ethanol to 10%. Some stations were slipping in 15% because it was cheaper to purchase and because there was no standard percent, amounts were all over the place. It also became a concern when auto makers started to recommend no greater than 10%Ah Gotcha, I assumed this was just a early name for todays gas, but sounds like it was something else entirely eh?
But oxygenated fuels are mandated in some instances, and with MTBE being banned or disused that creates a de facto mandate for EtOH.
Some states ban the use of MTBE in gasoline. California is one.From what I read, MTBE wasn't banned. The FedGov wouldn't give the oil companies immunity from lawsuits over groundwater contamination due to MTBE. So the oil companies stopped using it, fearing lawsuits and liability.
Right out of automotive tech school, I worked for a repair shop that also sold gasoline. This would have been in the early 80’s and in Kansas. This place sold unleaded, leaded premium and “gasohol”. Gasohol was rated (IIRC) 90 octane and our premium leaded was 91. I remember reading an article in a magazine how some wannabe racers were mixing gasohol and leaded premium to get slightly higher octane ratings. The theory was that the lead from leaded premium would mix with unleaded gasohol to raise the octane by a point or two. Sounds good in theory, don’t know in reality exactly how well it worked. However, I do remember that any car that previously ran leaded gas or unleaded premium and then switched to gasohol would probably need a new fuel filter within two tanks of using gasohol. It happened to all the customers, to my buddies and to me also. The gasohol had that good of cleaning properties. After a fuel filter change, all was well.Well, the dictionary today says it was/is a mix of 10% ethanol and 90% gasoline blend. I thought it was higher than that, but I could be mistaken. By the time the 10% ethanol blend got down to Missouri/Kansas, it wasn't called gasohol. At least, that is my dim recollection.