Ah, reality/hyperbole check: I sure hope that Tesla does not have "millions of real cars" on the road as that would mean the federal tax credit would have been eaten up by now. Even accounting for the number of cars that were sold outside the US. Now if you meant "millions of real car miles", then okay.
Ah yes - thanks for catching that. I was going back and forth between the hundreds of thousands of cars and the billions of miles and forgot to correct that.