Which fuel is commonly used in Top Fuel dragsters?

The fuel commonly used in Top Fuel dragsters is nitromethane. Often called “nitro,” it is the principal component of the fuel mixture used by the class, although teams generally combine it with methanol rather than burning a pure substance.

Nitromethane gives Top Fuel engines an unusual advantage: its molecule contains oxygen. That means the engine can burn much more fuel with the air available inside each cylinder than a gasoline engine can. The result is enormous power from a supercharged V8, despite nitromethane having less energy per kilogram than gasoline.

NHRA rules have changed the permitted blend over time. Modern regulations allow a maximum of 90% nitromethane, with the balance largely methanol. The limit is not a requirement, so a team may choose to run less nitromethane. Methanol is therefore a frequent source of confusion: it is present in the mixture, but nitromethane is the defining Top Fuel fuel.

The fuel also helps cool the engine as it vaporizes. A single run consumes a surprisingly large volume during warm-up, burnout, staging, and the pass, helping explain the class’s extraordinary fuel demand.