Brazilian researchers explored a number of diesel fuel alternatives in the late 1970s/early 1980s, including ethanol and vegetable oil.
A universal Mercedes diesel—the six cylinder Type 352—serves as a "test bed" for Brazilian alternative fuel research. This engine operates on diesel fuel, a mixture of diesel fuel and gasoline, or a blend of diesel fuel and vegetable oil. With minor adjustments, it burns alcohol too!
MOTHER EARTH NEWS STAFF
A small percentage of the Sao Paulo city bus fleet has been operating on alcohol as a diesel fuel alternative since last year with excellent results ... and far fewer toxic exhaust emissions.