Methanol carries an octane rating of 114, substantially higher than pump gasoline, enabling higher compression ratios and greater thermal efficiency in engines specifically designed for it. Its energy density, however, is considerably lower than gasoline — approximately 17 MJ/kg versus 34 MJ/kg — which means racing vehicles running on methanol consume fuel at a proportionally higher rate, requiring larger fuel loads or more frequent stops in endurance contexts.
The fuel's most distinctive safety characteristic is the nature of its combustion. A methanol-based fire burns with a nearly invisible flame, producing no thick black smoke. In the event of a fire on a racing circuit, this prevents the dense, opaque cloud that gasoline fires generate and that can obscure the vision of oncoming drivers. The trade-off is that an invisible fire can be harder to detect and suppress quickly, but overall the motorsport community has consistently judged the net safety benefit to be positive. A methanol fire can also be extinguished with plain water, simplifying on-track fire suppression.
Another combustion advantage is that methanol does not produce the same acrid, dense smoke as gasoline during mechanical failures, so drivers approaching an incident retain better visibility of the circuit.
The transition from gasoline to methanol in United States open-wheel racing was accelerated dramatically by the 1964 Indianapolis 500. A multi-car crash on the second lap resulted in a catastrophic fire fed by gasoline, killing drivers Eddie Sachs and Dave MacDonald. The gasoline-triggered fire created a dense black smoke cloud that blocked the vision of approaching cars. One driver involved in the incident was running methanol, and while his car also caught fire, the resulting blaze was markedly smaller and burned without the blinding smoke. That testimony, combined with advocacy from the racing press, led the United States Auto Club to encourage and ultimately mandate methanol for Indy car competition beginning in 1965.
Methanol remained the mandated fuel throughout USAC Indy car competition and was subsequently carried into the Championship Auto Racing Teams (CART) circuit, where it remained in use for the entire duration of that series from 1979 to 2007. The Indy Racing League used pure methanol from its founding in 1996 through 2006, when it briefly blended 10 percent ethanol with 90 percent methanol before transitioning to ethanol entirely in 2007.
Methanol is required by rule at World of Outlaws sprint car events, USAC sprint car and midget races, and many regional dirt oval sanctioning bodies. Sprint cars typically run naturally aspirated V8 engines of 410 cubic inches using mechanical fuel injection, and methanol suits their high-revving, high-compression powerplants. The invisible-flame and water-soluble properties of methanol are particularly valued in short-oval environments where spectators and safety crews stand in close proximity to the racing surface.
Beyond sprint cars and midgets, modified and late model classes at dirt tracks across the United States commonly run on methanol. Monster Truck events and Motorcycle Speedway are also governed by methanol requirements for similar safety reasons.
In drag racing, methanol is the required fuel for Top Alcohol Dragsters and Top Alcohol Funny Cars — classes that use supercharged engines but run on alcohol rather than nitromethane. Mud racers and heavily modified tractor pullers have also adopted methanol as a primary fuel source, sometimes in combination with nitrous oxide.
Top Fuel dragsters and Funny Cars use a nitromethane-based fuel, but methanol commonly constitutes the remainder of the blend up to the maximum permitted nitromethane concentration. Between 10 and 20 percent methanol is typical in Top Fuel fuel blends.
High-octane fuel blends based substantially on methanol were in widespread use in European Grand Prix racing during the 1930s. The most effective blends of that era included concentrations of approximately 86 percent methanol combined with additives such as acetone, nitrobenzene, and ether. These exotic mixtures were developed in parallel by competing factory teams and contributed significantly to the high power outputs of the supercharged grand prix cars of that period.
Running methanol demands material compatibility throughout the fuel system. Methanol attacks aluminum oxide coatings and can cause corrosion in components designed for petroleum fuels. Racing teams using methanol-specific equipment build their fuel tanks, lines, and injectors with compatible materials and often use fuel additives as corrosion inhibitors. Methanol is also hygroscopic, absorbing water vapor from the atmosphere, so sealed storage is important to maintain fuel quality and prevent dilution.
Despite its corrosive tendencies and lower energy density, the combination of high octane performance, superior cooling of the intake charge, and the meaningful safety benefits of non-opaque, water-suppressible combustion have kept methanol as the standard fuel in American short-track oval racing for more than half a century.