I have a speedometer/odometer on my 03 Club Car and replaced the batteries last September.
I trust it with no question to 30 miles; feel confident it could do 40 miles; wouldn't consider any further than that.
I have a bigger problem picking up nails/flat tires than worrying about running out of juice. I recently signed up with the **** Aide crew...having witnessed them in action to pick up a disabled cart within 15 minutes of an accident.
My better half has an 02 club car with batteries approaching 3 years old. He has a couple of questionable cells on one battery and his range right now is about 20 miles.
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Maryland (DC Suburbs) - first 51 years 
The Villages - next 51 years
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