Our home electrical setup is a little unusual as we live in a townhouse with a detached garage and the breaker box is in the house about sixty feet from the garage. Any additional circuitry would have to be underground so given the hassle we have not installed a 240 volt charger. So far, after driving the car about 2700 miles, we have found the 120 charging very adequate for our needs and are, according to the display, averaging about 123 mpg.
We have so far never charged the car anywhere other than our garage. Usually we don't run it down to zero range so it recharges fine during the non-peak electricity hours and, if it's fully discharged, we just override the timer to start charging early.
Great car. Not a single dealer visit since we picked it up. We've used 20.1 gallons of gas to date!
Silver 2012 Moraga, CA