Cover Story Flex Fuel Vehicles in the United States: Why Are We Lagging Behind Brazil? In Brazil, up to 90 percent of the drivers use flex fuel vehicles. In the States, it's 6 percent. What gives? Web Exclusive Flex Fuel Drivers at the Pump Flex fuel drivers are happy with their "green" fuel, but they are having trouble finding stations that carry it. Other features Sweetening the Biofuel Sector: The History of Sugarcane Ethanol in Brazil The future of the world's largest sugarcane ethanol producer depends on government action. Web Exclusive Brazil: Bioenergy Powerhouse at a Crossroads Brazil still has a chance to fully embrace biofuel, but the path isn’t as straightforward as it used to be.