Overview: F1 driver Jarno Trulli tries to get the most out of the hybrid Toyota Prius. Jason Plato pits the Volkswagen Passat R36 against the Audi A4 3.0 TDi in a contest of petrol power and diesel torque. Tim Shaw tests the acceleration claims of a range of performance motors. Tiff Needell competes with world speedway champion Jason Crump in a race of car versus bike.