Biobutanol is a liquid alcohol fuel that can be used in today's gasoline-powered internal combustion engines. Biobutanol is butanol produced from biomass feedstocks. Butanol's primary use is as an industrial solvent in products such as lacquers and enamels. However, the properties of biobutanol make it highly amenable to blending with gasoline. It is also compatible with ethanol blending and can improve the blending of ethanol with gasoline. The energy content of biobutanol is 10 to 20% lower than that of gasoline. Biobutanol proponents claim that today's vehicles can be fueled with high concentrations of biobutanol, up to 85%, with minor or no vehicle modifications, although testing of this claim has been limited.
No infrastructure for fueling vehicles with biobutanol currently exists. However, because biobutanol does not cause the same issues with corrosion or water contamination as ethanol does, it is likely that biobutanol would be able to be distributed through the existing gasoline infrastructure, including pipeline transport.