Looking at only the carbon from energy sources... (grid vs on-board IC)
Per Scientific American and Carnegie Mellon University
That's just for running. Does not account for production of the $40-60k battery packs.
The take away should be that full plug-ins are not always 'cleaner' than an IC hybrid. ...and that location makes a difference. ...and that Toyota makes cleaner cars than Mazda. --As I've said before, Toyota has one very efficient ICE.
And... Mercedes has an engine that is 20% more efficient than the Toyota engine.
IC engines are improving at a rate much faster than batteries. --bettcha you didn't see that coming. But then, who would. Electric cars seem so...
electronic. And seeing the advancement pace of computer electronics over the last 3 decades it's easy to expect that batteries would follow Moore's law too. Well, unless you were previously educated in those sorts of tech.