I mean, it is cheaper but it's not that cheap. There was recently a post here showing very clearly that for example in Germany electricity is so expensive that a good diesel car beats it in terms of cost easily. Even here in the UK if I were to charge at public points it would again be cheaper to just drive a diesel. It only becomes cheaper when I charge at home with a good tariff.
Besides, seeing as our roads are exclusively maintained from fuel taxes, I cannot see this going on forever - the government will have to find a way to tax the electricity going into electric cars somehow.
Sounds evil-ish, but how about gasoline tax paying for electric car recharge? Electric cars being very expensive to buy is a problem though. You'd end up subsidising those who are already wealthy.
I mean the car I have(volvo phev) currently has a deal where Volvo pays me back for the 1st year of electricity used by the car, they do it by having the car automatically upload the number of kWh used to Volvo servers, then they will pay me back based on the number of kWh I've used during that year.
I don't see why something similar couldn't be done for taxes - the car keeps track of kWh used and you just pay tax based on how much you used. Obviously, that runs into certain immediate problems - like, what if you drive abroad? Normally you'd simply buy fuel while abroad, so therefore contribute to taxes there - but with this system this wouldn't work anymore.
Maybe a GPS and pay-per-km-driven scheme would be more tamper proof. You can spoof a GPS as well, but it can be double-checked automatically by state traffic cams.
Besides, seeing as our roads are exclusively maintained from fuel taxes, I cannot see this going on forever - the government will have to find a way to tax the electricity going into electric cars somehow.