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Audi has devised a concept for using CNG (Compressed Natural Gas). It is based on the TFSI engine and retains the same pulling power even when running in natural-gas mode. The reduction in CO2 emissions of up to 20% in CNG mode can therefore be enjoyed without having to compromise on driving pleasure or luggage space.

The same applies to the ethanol drive system from Audi. It is designed to run on fuel consisting of up to 85 percent ethanol ? again without any loss of dynamism or sportiness. And yet, the CO2 output of such a drive system is around 75 percent lower when running on second-generation bioethanol than when it is burning conventional petroleum-based fuel.