Limited drivable range as in, no 3-5min recharge time at the station if a driver wants to quickly charge and continue toward next destination compare to a convention vehicle. Any person owning this vehicle are limited to 200mi range one way only, which basically means its grounded in a city with a 100mi range travel radius for the driver to be able to get back to start destination. There's no state to state driving option with this type of vehicle especially when it costs as much as a touring sedan and a sticker/tab fee of $300-500 yearly. For people who wants versatility this type of vehicle is a luxury they can't afford to fork out $30-40k. So the wise consumer would rather settle for a conventional vehicle rather than a EV.
As for the Chevy Volt, if I recalled correctly, it can run on battery power alone for 40mi before the gas engine kicks in. The combined mpg is estimated at 93 mpg as you pointed out but I've never driven one to log in real world driving conditions to confirmed if the rate is true or not. It is still a pretty expensive car to own and still gives drivers reasons to complain about power. Chevy bolt does better, but it runs on pure electric power the only benefits is that electricity is cheap. It would only cost about $8.4 for a full charge for a rated battery of 60kWh @ $.14/kWh assuming charging station is 100% efficient. Double the total distance on a single charge compare to the most efficient gas/dsl vehicle, you can pretty much say that your power cost is about 60% less than regular gas powered vehicle. I don't know if a saving of $10-12 month on fuel cost justifies owning a EV.