The manual for my 2017 Yamaha indicates that the use of gas with up to 10% ethanol is OK. It does not recommend the ethanol free gasoline. Older carts might be different. If you begin to use gas with ethanol after using non ethanol gas for a while, the ethanol will dissolve the varnish buildup in the fuel system and clog your fuel filter. Ethanol can cause problems in fuel systems that were not designed to tolerate it. I only use the fuel additive if we are going to be gone for an extended period when the cart will not be used.
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