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For daily use, definitely the higher octane w/ ethanol. For long storage, the ethanol free. I never really bought into the "fears" of keeping the ethanol fuels over time, but I was wrong. In as short as 1 year, they can begin to gel and cause all sorts of problems. Thankfully I didn't discover this in my Boxster, but in a pressure washer....totally gummed up the carb, which resulted in having to disassemble and clean. Learned my lesson...for any item I use infrequently or store, I keep ethanol free fuel around, don't even mess with adding stabilizers.
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