The basic fuel available at competitions in the Formula SAE Series is unleaded gasoline. For the FSAE North American competitions this should have an octane rating of 91 (R+M)/2 (approximately 95 RON) minimum and for other competitions, the unleaded gasoline that will be available will be published by the relevant organizing committee. However, the basic fuel may be changed at the discretion of the organizing body. Other fuels may be available at the discretion of the organizing body