Some autos currently on the market display specific aspects of Revolutionary design, and are progressing on the path towards truly Revolutionary autos. While some manufacturers have moved down the y-axis by pursuing advanced propulsion systems, truly Revolutionary vehicles will pursue both aggressive lightweighting goals (moving along the x-axis) and some form of powertrain electrification. For example, both the GM Volt and Nissan Leaf employ highly-efficient electrified propulsion systems and are marvels of powertrain engineering. However, their weight leaves far too much efficiency potential on the table. Tesla's upcoming Model S is predicted to weigh about 35% less than a comparable auto, giving the aluminum-based battery electric sedan more range and greater efficiency. Models like VW's XL1 and the Toyota 1/X exhibit real Revolutionary design. Their use of lightweight composite materials coupled with superefficient hybrid powertrains push them into a whole new realm of automotive efficiency and potential strategic advantage.