And it turns out that the Toyota Prius isn’t necessarily that great for the environment after all. (This should not come as a surprise if you’ve been keeping up on the research into renewable energy.) Listen closely to the end of the segment, though—the point isn’t that the Prius cannot be more efficient than the M3, but rather that the driver has to do his part to drive more conservatively, too—something that I’ve argued, and been keenly aware of, since I started driving.