With an average of 315 Wh/mi I've used 4739kW of electricity and that's with some pretty spirited driving. At $0.11/kW that's ~$520 worth of electrons used. There are some vampire losses not figured into those numbers, but there was also some "free" charging not figured in, I figure it's a wash. Doing the math at current gas prices (I'll use $3.50/gallon) I would have purchased 148.5 gallons of gas...I'd have needed a gas car getting 101MPG to go 15,000 miles for that cost. I've accumulated a lot more miles than expected. My Prius averaged 12-18k miles per year. I got my Tesla Dec. 3, 2012, so I'm on track for about 22,500 miles in my first year! It's out preferred vehicle for pretty much everything. Loaf of bread at the shop a mile up the road to a 230 mile one way trip for a Cardinals baseball game. I've taken ~6 "long" trips of over 400 miles round trip. I've had many of the widely reported issues reported by other early adopters (one spontaneously opening door, fogging driver's side window, moisture on the tail lights, clicking steering, etc.), but no major operational or safety issues at all. The only lingering annoyance, really, is the lousy audio quality for the bluetooth microphone. It is awful to listen to on the outside caller's side, and leads to problems with the voice recognition being practically useless. Could not be happier with this choice. We still have the Prius and Highlander Hybrid, my wife switches back and forth b/w the HiHy and the Prius as her daily driver while we await arrival of her Model X still some 18 months from now.