Re: Can Iso-Heet be used in FEH?
If your gas already has 10% ethanol in it (as many states do), it's a waste of money.
Products of this nature are only needed once or twice in the spring and fall (when condensation occurs), and only when you suspect water in your tank, not all winter long.
IMO, it's not needed at all these days.
OTOH, maybe you just want to use an injector cleaner a few times a year.