Audi isn’t committing to any specific fuel for the near-future. Instead it’s hedging its bets and exploring all sorts of cleaner, greener fuels – but it is planning to put a lot of them into production. The only thing that the company sees as a certainty is that hydrogen will not be in anything approaching general use for at least another 20 years.
And when hydrogen does appear it will be in fuel-cell guise which Audi believes is a more efficient method than using hydrogen as a fuel to power traditional combustion engines, a la the BMW Hydrogen 7 and Ford C-Max H2 ICE.
Source: Car Magazine