So which carmaker is the world's cleanest? Not sure? Well, an independent survey released last week has found that BMW has most improved its average fuel efficiency and CO2 emission rate. Indeed, it's done so to an extent which will embarrass other carmakers.
The study, began from 1990-2005 by Environmental Defense, a US-based non-profit environmental advocacy group, which shows BMW has improved fuel economy by 14 per cent and carbon emissions by 12.3 per cent.
The next best reduction was Toyota's 3 per cent. The C02 performance of every other leading carmaker deteriorated.
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