Yamaha recommends 87 octane E10 gasoline for their golf cart engines, and that is all I have ever used. No fuel issues. I think their engineers know what is best.
The issues you hear about with ethanol blends date back over 20 years ago. Back then, ethanol was known to attack soft seals and fuel lines in some engines. However, vehicle manufacturers have addressed that issue long ago. It was also more apt to negatively affect a carburetor vs fuel injected motors. Again, modern engines successfully address any concerns.
Ethanol also has an affinity for moisture, and has a lower boiling point than gasoline. This combination led to the potential to vapor lock a fuel system in some applications. This problem has also been successfully handled by modern manufacturers.
In short, E10 fuel will not harm your golf cart. Any performance degradation related to ethanol blends will be hardly noticeable in a single-cylinder golf cart engine.
Now...the whole premise of using food for fuel? That's another soap box.
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