"270 mile range sounds fantastic (my car only gets 210 miles to a tank)."
You should get a better car. I drive a VW TDI, and on a half tank (somewhere between 12 and 13 gallons) I can do at least 200 miles -- and I do not exactly drive in a way that maximizes fuel efficiency. Diesel cars sound a bit different and smell a bit odd after short trips, but even with higher-priced fuel you are going to see a cost advantage to diesel (maintenance is a bit pricier too, but even factoring that in you'll have a cost advantage).
What I really want, though, is to take that diesel engine and plug it into an electric motor, like a railroad locomotive. Charge the battery when I can, get 400+ miles on a tank of diesel otherwise (probably even more, though, since the diesel engine could maintain its optimal RPM while generating electric power). I'd sacrifice my trunk space for it if I had to.