How much does it cost to recharge per mile?
http://www.caranddriver.com/reviews/2011-chevrolet-volt-full-test-road-test
...In our experience, using only standard-household 120-volt power, it took about 13.4 kWh of electricity to replenish the Volt’s 9 kWh of usable energy...
...Assuming 35 miles of electric range for the Volt yields a cost per mile of just 4.6 cents. That’s almost 40 percent less than that of a Volkswagen Golf TDI diesel getting 40 mpg and 24 percent cheaper than a Prius getting 45 mpg...