UK motoring journalist Tom Ford drove a new BMW 320d EfficientDynamics sedan from the UK to Munich and back, on one tank of diesel fuel. The total distance travelled was 1,630 kilometres (1,013 miles), which means the car delivered 68.9mpg overall and CO2 emissions of only 109g/km. These are the same figures claimed by BMW.

Ford says he tried to drive carefully but did not drive as though he was on an economy run. At some point on the way to Munich he even achieved 75.9mpg.

"Think about it in the context of everyday motoring: comfortably more than 1,000 miles on one tank of diesel means just 12 fills a year for the average motorist - and even driven normally I still think you're looking at 750 - 800 miles (1,207km - 1,287km) per fill. BMW's EfficientDynamics: it does what it says on the tin," Ford said.

The car makes 122kW (163 bhp/ 165 PS) between 3,500rpm to 4,200rpm, and 360Nm of torque between 1,750rpm to 3,000rpm. Fuel-saving technologies employed include Auto Start-Stop, Brake Energy Regeneration, a longer transmission ratio, a lowered suspension and Michelin EnergySaver tyres.