I don't really have any knowledge to back this up, but maybe older cars would react better to E0 because their ECU programming is less sophisticated, and newer cars are better programmed to handle different grade fuels?
Have you tried E0 in any of your other cars with success?
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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