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Mercedes F125 concept (2011) at Frankfurt motor show

Mercedes today unveiled the F125 concept car - a car bearing the three-pointed star's F name to demark it as a tech testbed, and the 125 to mark Merc's 125th anniversary in this four-wheeled business. It's a hydrogen fuel-cell vehicle, and Merc claims a punchy 1000km (620-mile) range. But the scientists here are proud of the cutting edge lithium sulphur batteries, used to store energy created by the fuel-cell.

Porsche Boxster E (2011): prototype Boxster EV

Porsche recently rolled out the first of three Boxster E electric vehicles, to take part in the 'Electromobility Region Stuttgart' local government initiative in Germany. The Boxster E is powered by two electric motors, capable of a peak power output of 180kW. Energy is stored in a 29kWh battery pack.  Not with the Boxster E. Three electric Boxsters are being built as part of a programme sponsored by the Baden-Wurttemberg state government (Porsche's home state in Germany) and WRS, the Stuttgart Region Economic Development Corporation.  Porsche's hometown of Stuttgart is one of eight model regions participating in a federal pilot programme sponsored by the Minitsry of Transport, Building and Urban Affairs to develop EVs and their supporting infrastructure.  The three Boxster E prototypes will take part in the programme, acting as mobile laboratories for testing EV usage and planning for EVs in urban infrastructure.  CAR's view? We reckon this electric Boxster E is much cooler than your usual EV council van.

Porsche 918 Spyder laps the 'Ring in 6:57

The stunning Porsche 918 Spyder was revealed at the Frankfurt motor show on Tuesday. The near million-dollar car has a price that's four and a half times higher than the Porsche 911 Turbo S. It was built to battle the new crop of supercars including the Ferrari LaFerrari and McLaren P1.