I purchased an electric Club Car 3 years ago new. I have had one battery replaced about a year after purchasing the cart at no cost. About 1 year ago I purchased a solar panel for the roof of the cart. At that time I felt my batteries were weakening. The solar panel does not produce outstanding results but what I did notice that my batteries seemed to be working like they were new again. I have both a gauge (red lines) and a yellow light on the cart. I used the gauge to determine how much juice I have left in the batteries. When the batteries were new when I went over the Morse bridge the gauge showed on the second line when new but had deteriorated to the 3rd line prior to the solar panel. It then went back to 2 lines afterwards. As far as estimated range I think it would depend on whether your going max. speed (19mph) or something less to conserve batteries. Of course colder whether has a negative effect on batteries. I would estimate that by driving conservatively I could get 35 miles but I have never driven 35 miles to test it out. I do have a speedometer in the cart.
As an aside the women at the Club Car dealer told me that the red gauge was not accurate. However, when that's all you have to go on you use it to compare.
I have driven gas carts on the courses and find that I don't like the fact that when I step on the gas there is a hesitation before the cart starts moving which doesn't happen in an electric cart.
Fortunately I live in pretty much the center of the Villages and don't think I will ever need a gas cart to get to the ends (unless of course they go south of 44
John