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1.8 Million Barrels of Oil a Day Avoided from Electric Vehicles
(cleantechnica.com)
This is a most excellent place for technology news and articles.
I would have to dig to find it, but I remember reading years ago in a Car and Driver article that EV's powered by even the dirtiest coal power plants will still return around 30 MPGe, which is better than most vehicles on the road today.
Granted that article was from before the Hummer EV, so I'm sure that number will have changed somewhat.