Generally the combination of booze and driving is discouraged, but not in the U.K.'s royal family. Prince Charles has converted his vintage Aston Martin DB6 to run entirely on bioethanol fuel distilled from surplus British wine.
While it won't reduce the prince's carbon footprint too dramatically as he only drives the car 200 to 300 miles a year, the transition to green is a nice gesture. Conversion of his private jets and helicopters to run on gourmet food items is still underway.