You definitely don't buy an electric to save money from the get go. In fact its likely that you wont begin to see any savings until years after the initial purchase. You'd have to go all in for a home charging station if you really wanted to maximize savings early on. $3 of gasoline gets you 30 miles and hybrids get 60.
I bet its reasons like this that will get people to convert to off the grid systems for their home, that way they might just be able to make returns on the purchase of all one time payment electric stuff like the in home system, an EV, and so on.