Smart is one of the most green car, you can buy, but Mercedes-Benz recently introduced three more economical mode: a battery electric prototype of a new diesel and petrol versions, the switch below 5 mph, you can win in Driving an interview with cable competition. Andrew CHENG reports.politicians English is not good, in the selection of winners. Livingstone and his knowledge of the Gang of Four pedants in the London Transport decided to assume that the reason for the environment, in favour of gasoline - electric hybrid technology, and concluded with a huge Lexus limos driving through the capital is free of charge. However, if the mayor is Boris Johnson has never been touched, he may achieve the measures, the success fee discount crowded, cars are the real fuel efficiency, such as those automatically switched off, fixed - peace alone should he win another This type of vehicle the word has been around for a while, but a stop / start "micro-hybrid" version of the small two-seater Smart - has been one of the most economical vehicles sold in the United Kingdom - has recently launched its parent company, Mercedes - Mercedes-Benz, Next to a new 7 99cc diesel will go on sale next year, here in January and advanced battery electric prototype, built in cooperation with British experts z ytek, which is now on trial.