The trade-offs (if you need to reminded), are that more batteries = more weight, higher cost, and less interior space. As weighed against more range, which to some folks = nirvana. And 'range' is the EPA-rated range, if you have to ask. Finally, I don't think this question is terribly price-dependent. Unacceptable range is unacceptable range, regardless of whether it's a 3, an S or an X, or some future cheap sub-$25K Tesla (maybe you just swear at it a little less if it's a *cheap* unacceptable-range car ). .