IMHO, the technology isn't there yet. The range is a problem and is reduced further in the hot summer and cold winter weather because the AC and heaters, respectively, are a drain on the battery. The real advantage, of EV is for a lot of short trips (think post office vehicles) where there is also a lot of stop and go as in city driving (energy that would normally be lost to heat in the brakes for gas vehicles is returned back to the batteries in EV's). I simple trip that I make from LI to Boston area is dicey, especially in hot or cold weather, with a EV (an easy 1/2 tank of gas with my gas vehicle).
As far as saving fossil fuels perhaps someone can explain to me where the electricity comes form — I don't know of any waterfalls/river dams powered hydroelectric or nuke plants around here.