Earth991 reports on an orange twist:
Tire manufacturer Yokohama is now selling a model made with 80 percent non-petroleum material, substituting orange oil as the primary ingredient to make vulcanized rubber. The new tire is called the Super E-spec™ and has already received the Popular Mechanics Editor’s Choice Award in 2008. Yokohama will initially market the tire for hybrid car models such as the Toyota Prius. – from Earth911