Not worth the upcharge.
Ethanol and biodiesels have a cleaning effect on the engine. They also soak up water. It will only gum up an engine if gas has gotten real skanky by sitting idle - because it's cleaning the junk out. That's also why you always hear people say ethanol gummed up "my OLD truck." It cleaned the engine. I'm sure old seals can be dissolved by it . . . but I'd be shocked if manufacturers didn't switch to seals that accommodate ethanol ten years ago.
It's best to use the 87 the manufacturer recommends . . . and to settle on one type of gas and use it all the time.
Today's golf carts are built to run on gas with ethanol - so any perceived benefit of non-ethanol gas is not worth the upcharge.
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