Minnesota has been the first US state to switch nearly all its diesel supply to a blend of 20 % biodiesel and 80 % petroleum diesel , called B20 . Like the previous B10 requirement, B20 will appear at the pump from April through September. The US Environmental Protection Agency has recognised this as the only advanced fuel because it can reduce greenhouse gas emissions by more than 50 % . In the 10 years since biodiesel became a fuel standard in Minnesota , carbon dioxide emissions have fallen by more than 7.4 billion pounds , according to the American Lung Association of Minnesota .
Minnesota has been the first US state to switch nearly all its diesel supply to a blend of 20 % biodiesel and 80 % petroleum diesel , called B20 . The US Environmental Protection Agency has recognised this as the only advanced fuel because it can reduce greenhouse gas emissions by more than 50 % . In the 10 years since biodiesel became a fuel standard in Minnesota , carbon dioxide emissions have fallen by more than 7.4 billion pounds , according to the American Lung Association of Minnesota .