2023 marks a major shift in the Renewable Fuel Standard (RFS). From the 2007 Energy Independence and Security Act until this year, the annual required volume obligations (RVOs) under the RFS were set by statute; that changes in 2023, and so could the mix of renewable fuels – or at least the process of setting the RVOs.   The first year the 2007 Act was in effect, conventional ethanol made up 100 percent of the total RFS; by 2022 the statutory schedule called for 58 percent of total renewables to be advanced biofuels, with biomass based diesel at less than 3 percent (1 billion gallons out of 36 billion gallons total). Cellulosic was scheduled to be nearly 45 percent.  Obviously, cellulosic biofuel didn’t material...