I believe blend is one of the factors, it's probably different for many areas, different for different refineries.
Another big factor is evaporation. The temperature where the equipment is stored, where the gas is stored, how long it's stored, but most importantly how well the containers are sealed. Same thing with the design of the individual piece of equipment, if the tank is (somewhat) sealed, the design of the carb as to how the bowl is vented.
And finally the design of the carb itself. Some have very light plastic floats that stick easier than the heavier brass floats. Some draw fuel directly off the bottom of the bowl, so any residue clogs the jet. Just the basic design can cause some to be very fickle, others forgiving. The older carbs use rubber components that are not ethanol resistant.
That said, today's gas is designed to meet the mass market, cars and trucks with sealed and pressurized fuel injection systems made with ethanol resistant components. The carbeureted engines don't meet the criteria, so there can be problems.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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