The report showed that a hybrid or conventional car getting better than 35 mpg in some parts of the country ARE CLEANER to operate than an EV because the regional power generation plants were mostly coal powered. There are several 2012 vehicles that meet or beat that mark.
The area were gas is cleaner grows with every mpg closer to 41. A handful of 2012 hybrids already meet or beat that mark.
With 60 mpg hybrids on the horizon, it will be cleaner to operate a gas powered car than an EV in over half of the US.
http://www.smartplanet.com/blog/transportation/how-8216green-are-electric-vehicles/1592?tag=mantle_skin;content