Business Green: Toyota’s iconic Prius, beloved by environmentalists and right-on movie stars, saw its mainstream status well and truly cemented this week following reports from one dealer group that it was the best-selling car in Japan during May. The figures show that Japan’s attempts to kick-start its flagging economy and car industry may be working — for Toyota at least — with the Prius topping sales charts from the Japan Automobile Dealers Association, having sold about 10,915 cars in …