With an average fuel consumption of 4.1 lt/100 km (57.4 US mpg) and CO2 emissions of 109 g/km, the diesel-powered Opel Astra 1.3 CDTI ecoFLEX hatchback was already a frugal and eco-friendly proposal. However, GM's European division decided to do further improve the Astra's green-credentials by adding a rather effective Start and Stop system. Read more »