For anyone interested in the economics gasoline, diesel and electric power translates into actual costs of ownership, please do have a look at the Department of Energy handy-dandy calculator: http://www.afdc.energy.gov/calc/
It's interesting to play with the cost of gas: if we internalized the military expenditures and losses due to climate change, electric vehicles clearly win out at $10-15 per gallon. Because those costs are hidden from people at the pump, they're tricked into thinking it takes electric vehicles several years to break even with their traditional counterparts.
Even with the distortion of the socialized costs of fossil fuel production and security, it still costs about five times as much to drive a gas or diesel car. That's because physics