Tesla Promises More Range

Tesla 3.0 RoadsterWord is the upcoming roadster upgrades from Tesla Motors promise a 400-mile range.

That may have some supercar aficionados rethinking goin’ green.

Most of the improvement comes from a new battery and low-friction wheel bearings. Of course a body restyle kit helps lower air resistance- and looks nice. The retrofits should be available sometime early 2015. No word yet on pricing.