Reuters: The big four auto makers in Brazil joined forces with the Sugar Cane Industry Association (Unica) on Wednesday in a campaign aimed at expanding the use of cane-based ethanol in flex-fuel vehicles. Local subsidiaries of U.S.-based General Motors Corp and Ford Motor Co, Italy’s Fiat SpA and Germany’s Volkswagen AG will together distribute 2 million free booklets explaining the benefits of ethanol for consumers who buy their flex-fuel cars in Brazil. “Brazil’s interest in ethanol …