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Militant EV driver!
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The CO2 from the Ampera can be calculated easily enough.

- Grid CO2 per kWh is 430g (per DECC)

- Grid losses are 9% (DECC)

- Ampera's NEDC range is 83km (Opel)

- Grid electricity for a full charge is 12.8 kWh (GM)


So g/km = (430 * 1.09 * 12.8) / 83 = 72.28


I know the 83km NEDC figure is a bit optimistic, but that's the test cycle that old fashioned cars use and we want to compare like for like.


By the way, I heard that this year's number is 7% lower, but we will have to wait for the official update to the tables.
 

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When comparing this with ICE cars do not forget that their tailpipe emissions do not include the energy used to refine and transport the fuel. The so called well-to-wheel argument.
 
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