The Roadster is rear wheel drive. Tesla has mentioned that 0-60 times are "traction limited" because the rear wheels would slip if they tried to accelerate much faster. 0-60 time could be (theoretically) improved if they had some powery deliver to the front wheels as well. Tesla has said that the Roadster ESS is able to soak up all the regen braking they get from the eMotor. When you hit the brakes, the weight distribution shifts to the front tires, and brake portioning will have more braking going to the front calipers. So, much braking energy (particularly under hard braking) is wasted as heat on the front discs. If there was a regen system on the front wheels it could possibly capture more regen energy. Now, with all that said, I still think they are doing the right thing with the roadster. The Lotus chassis wasn't designed for a lot of mechanism up front, and having no drive shafts there helps keep a "pure" steering feel on such a light, small sports car. Whitestar, on the other hand, could probably benefit from AWD for the above reasons, as well as for foul weather traction. I wonder if Tesla is considering it. It would think a small self-contained system could be a very marketable item. A small eMotor with Ultracaps, that only charges from regen, and only provides eBoost during hard acceleration. It wouldn't be a primary drive source... Only an aux source for energy "recapture" and "playback" during hard braking and hard acceleration. The main source would drive one set of wheels, and the aux unit would drive the other. Toyota does something a little like this with their AWD Highlander Hybrid, although in their case both electric drive motors share the same traction battery pack.