Here's a synopsis of more than 40 studies on source-to-wheels carbon use:
http://www.pluginamerica.org/images/...onsSummary.pdf
Page 5 in particular shows ICE's producing ~500g/mile, and EV's ~220g/mile on today's US grid.
Another source for carbon emissions:
http://www.plugincars.com/doublechec...rs-104202.html
Quote:
For San Francisco, near where I live, I used a CO2 average of three different grids (from eGrid)—listed in kg/CO2 per kWh of 0.1 to 0.183 as .36, .45 and .66 (this is right now)—to indicate emissions for 15,000 miles of driving as follows:
* 4,345 pounds of CO2 for the EV
* That’s tremendously cleaner than the 30-mpg car’s 11,850 pounds of CO2
* It’s also way better than the 50-mpg hybrid’s 7,110 pounds of CO2
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So, the first link puts the carbon output of EV's at 44% as much as ICE's and the second has EV's at 37% as much carbon output as ICE's -- on today's US grid.
Edit: Another interesting link about using solar panels to offset the electricity used for an EV:
http://www.teslamotors.com/blog/elec...ic-solar-cells
Also, note that the Tesla Roadster uses about 200Wh/mile; which is lower than the numbers used in the original post of this thread.