I have been asking the same question and was told that Par Car did a supervised and ideal condition related test once and got 80 miles.
I doubt all things equal that an electric cart can get 80 miles per charge on a consistent basis. I would be happy to get 50-60.
I have 6-8 volt batteries and get 35-40. But honestly I don't trust even that and charge by batteries after each use
By the way par car used 8 maintenace free batteries that are very expensive
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