Avgas 100/130 is dyed green The 100/130 grade within each of these specifications has a lean mixture Motor Octane rating of 100 and a rich mixture Supercharge Octane Performance number of 130. Currently, there are 22 approved “Issuing Organizations”, mainly speedboat, hot rod, and speedway, but including CAMS and the Australian Historic Motoring Federation (GPO Box 2862, Canberra, ACT, 2601). These groups issue “Leaded Fuel Passbooks”, on behalf of the government, to members of their associated clubs which allow the purchase of Avgas from your local supplier (mainly airports and race circuits.) Hope that helps