Interesting... http://www.teslamotors.com/blog/driving-range-model-s-family

OK, many of us have remains of semi-stale gasoline in our Volts' gas tanks, but with the cold weather, holiday season travel, and winter gasoline mix, some of us are about to find ourselves in that long-forgotten place called a gas station and encounter E15 gasoline. According to the 2012 Volt...

The EPA has their efficiency ratings for the 2012 Volt up on FuelEconomy.gov, and it's showing a highway "Electricity Only" efficiency of 93 MPGe -- up from 90 MPGe for MY2011. This bumps up the combined city/hwy efficiency from 93 MPGe to 94 MPGe. http://www.fueleconomy.gov/feg/phevsbs.shtml...

Perhaps this was posted previously however I could not find the reference. In case you have been confronted with "oh you have an electric car - great, now you're burning coal..." You can determine the mix of fuels used by your utility through this EPA site which was recommended to me by a...