For the utterly bargain price of just £1 per litre, Green Fuels took the excess wine and did some excellent science-y things involving boiling off the alcohol content of the liquid, condensing it down and removing water. This created 99.8% pure ethanol – which was then topped up with alcohol from fermented whey collected at a local cheesemakers. (Oh yes, I forgot to mention the cheese. Incredibly, wonderfully, Charles’ car is powered not only thanks to wine, but cheese as well. I bet you never imagined that this classic combination could be put to work in such an unusual way).
Whilst this magic was happening in the Gloucestershire countryside, Prince Charles was talking to Aston Martin about the potential for an eco-friendly means of transport, and hit upon this biofuel as the perfect answer. Aston tweaked the DB5’s carburettors to allow more fuel to hit the engine, and consequently enabled it to run on a mix of 85 percent wine-derived biofuel, topped up with 15 percent petrol. Job done!