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When running de-icer (HEET, ISO-HEET, ISOPROPYL, etc), what do you guys do with your ethanol switch ... leave it on "regular" if you're running regular gas? Or does your gas become more or less "ethanol" gas which requires the switch to run in ethanol mode? I'm just curious because I've run ISO-HEET in my efi's for years and have never run it in "ethanol" mode. Wondering if I should be doing something different? :huh: