I think location & climate will play a huge part in the success of this use of an electric vehicle. You would need a very concentrated city with a temperate climate. A cabbie waiting at the Houston Airport running the AC on a 100° day waiting to drive somebody an hour across town won't get many fares per charge. Neither will one in NYC when it's 5°.
Maybe a special Taxi package that packs extra insulation (which they should all have anyway) and extra batteries (front passenger side being wasted), without all the electronic crap that will drain the batteries should be made available from the manufacturer. I don't know if a custom made solar panel roof would ever pay for itself or not.
I think the energy savings while driving in stop & go traffic would be staggering.
Don
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