Prince Charles ' office reveals his car runs on biofuel made from surplus wine . The prince uses wine from a vineyard close to his Highgrove Estate , the spokesman said . Prince converted other cars to run on biodiesel fuel made from used cooking oil . Report says prince 's car cut carbon footprint by 50 percent last year . The prince called for strong interest in environmental issues and rural development .
Prince Charles ' office reveals his car runs on biofuel made from surplus wine . Prince converted other cars to run on biodiesel fuel made from used cooking oil . Report says prince 's car cut carbon footprint by 50 percent last year . The prince called for strong interest in environmental issues and rural development .