Well there was about twice as much coal on the grid then compared to now. One other issue is whether you look at short term marginal, long term marginal or average emissions. I’ve used average emissions for a number of reasons : blog.ucsusa.org/dave-reichmu...

Driving on Electricity Is Now Much Cleaner than Using a Gasoline Car

Emissions from driving the average EV in the US are equal to a hypothetical 93 MPG gasoline car.

Thanks! That was an interesting read!