Methanol is an alternative fuel for internal combustion and other engines, either in combination with
gasoline or directly ("neat"). It is used in racing cars in many countries. In the U.S.,
methanol fuel has received less attention than
ethanol fuel as an alternative to
petroleum-based fuels, because in the 2000s particularly, the support of corn-based ethanol offered certain political advantages. In general, ethanol is less toxic and has higher energy density, although methanol is less expensive to produce sustainably and is a less expensive way to reduce the
carbon footprint. However, for optimizing engine performance, fuel availability, toxicity and political advantage, a blend of ethanol, methanol and petroleum is likely to be preferable to using any of these individual substances alone. Methanol may be made from hydrocarbon or renewable resources, in particular
natural gas and
biomass respectively. It can also be synthesized from CO
2 (
carbon dioxide) and
hydrogen.