The Prius, which will be completely overhauled next year, still remains the most fuel-efficient hybrid automobile on the market. Nicknamed the ?friend of the planet?, the Prius offers a very uninspired driving experience and isn't very powerful, but is well adapted to North-American deiving conditions. Inside, you will find ample space for four adults and a lot of comfort, while you will be surprised at how silent it is on the road. Its average fuel-consumption, which is about 4.5 litres per 100 kilometres, can jump 30% in winter.