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Swiss firm Rinspeed aims to solve the "range anxiety" issue associated with electric vehicles with its range-extending Dock+Go concept. The Dock+Go system is unique in that it's specifically designed to match the electric vehicle that it will be fitted to. Additionally, Dock+Go is easily detached when its range-extending capabilities aren't required.

The motor from the third-generation car offers 55 kw with 96 lbs-ft of torque. That's up from the second-generation, which makes 30 kW with 88-lbs/ft of torque. That's a big improvement. The manufacturer says acceleration 0-to-62-mph is down to 13 seconds.

The sales race between the Nissan LEAF and Chevy Volt for leading electric car has been neck-and-neck most of this year. But in May, Nissan pulled way ahead of G.M. tallying 1,142 sales of the LEAF, while Volt sales remained flat at 481 units. The total number of sales of both vehicles is essentially equal—2,184 units for the Volt and 2,167 units for the LEAF. Yet, all eyes are on the emerging pattern now that both companies have had six months to ramp up production, and begin working toward annual sales targets.