I'm familiar with what Tesla says they will do, I get the press releases as soon as they are online. Saying and doing are two different things and so far they have a track record of overpromising and underdelivering, it just happens to be that their missing the mark has still been damned impressive.
As to CO2e, Union of Concerned Scientists had this (mostly positive) to say:
http://www.ucsusa.org/clean_vehicles...tric-cars.html
http://www.ucsusa.org/assets/images/...ons-fact-2.jpg
The report uses the Nissan Leaf as a base case, which is about 20% more efficient than Model S, and in most of the Midwest, driving a Leaf equates to the equivalent greenhouse emissions of a 31-40mpg car. The 740i is a ~25 mpg car driven reasonably. If you live on the coasts, especially the west coast, it's not even close