A DrivE sign is pictured on the Volvo V50 car during the second media day of the 80th Geneva Car Show at the Palexpo in Geneva March 3, 2010. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT BUSINESS) 

A combination picture shows logos of Mitshubishi iMiev, the BYD E6, Volvo V50, Volkswagen Passat, Honda CR-Z, BMW ActiveHybrid 7, Peugeot 307CC, Mitshubishi iMiev, SAAB 9-3 Bio Power XWD, Seat Ecomotive, Ford Hybrid, Hyundai Hybrid, Toyota Prius and BMW Series 5 during the second media day of the 80th Geneva Car Show at the Palexpo in Geneva March 3, 2010. REUTERS/Staff (SWITZERLAND - Tags: TRANSPORT BUSINESS) 

Various logos on eco-friendly cars are seen on the first media day of the 78th Geneva Car Show at the Palexpo in Geneva in this March 4, 2008 combination photograph. (From top to bottom) The logos belong to (first column) Saab BioPower, Toyota Prius, GM Hydrogen4 concept car (twice), E'mobile Volvo V50 and Rinspeed sQuba; and (second column) Mitsubishi iEV, Cadillac Escalade, Volkswagen GTI, Renault Eco2 logo and Gasmobil Mercedes-Benz E200 NGT. REUTERS/Denis Balibouse (SWITZERLAND) 

Ford Motor Company the 2005 Volvo V50 station wagon during the January 5, 2004 press day at the North American International Auto Show in Detroit, Michigan. The V50 features a five-cylinder, 218-horsepower engine. REUTERS/Rebecca Cook RC