I also seriously doubt that ethanol caused the problem with the 2-year old cart. But ethanol does have a long term negative effect on small gas engines. When I read about that a few years ago I started using premium fuel in my Club car. The price difference for a golf cart is negligible, but I have noticed consistently better performance. No more occasional backfires, hesitation, etc. I change the filters and spark plug regularly but notice no real difference before or after a tuneup.
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