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Depends on where you live.ive let 10% ethanol sit for 6 mos in carbureted vehicles, zero issues. its fine.
I have done that and it cost me a new carburetor.ive let 10% ethanol sit for 6 mos in carbureted vehicles, zero issues. its fine.
heres the issue, especially with cheap modern shitty small motors they use in power equipment these days . they typically don't use FKM for the seals or fuel lines, (viton). buna, which shows up a lot, however, is used a LOT and it reacts poorly to ethanol.
nothing else is 'designed' differently, and you cerialy do not need anything over 87 up to 10:1 compression, and that's being conservative.