http://synbioproject.tech/cpi/applications/butamax-biobutanol/
Generally blended with gasoline, biobutanol can be used to fuel cars and other vehicles. It can be combined with gasoline on its own or alongside ethanol to help enhance that biofuel’s performance in a fuel blend. Source
Biobutanol is an alcohol that can be produced from renewable, organic material (biomass) including corn, wheat, sugarcane and—in the future—non-food plants. This advantaged biofuel was developed to accelerate the shift toward renewable transportation fuels that lower overall greenhouse gas (GHG) emissions. Source