Old vegetable cooking oil from restaurants is free. A car can actually run on either. So why aren't more people ditching petroleum and running on peanut power? "[Making the switch] couldn't be ...

Irish Ferries ’ high speed catamaran Dublin Swift has become the group’s first vessel to use hydrotreated vegetable oil (HVO) ...

Its vintage charm and the panoramic views from its historic passenger cars are ... a diesel-powered dynamo. Another tune-up in 2009 modified it to run on recycled waste vegetable oil.