Table 1-11. Permissible Fuels TM 9-2320-361-10 1-28. TABULATED DATA (Contd) NOTE Primary fuels listed below must be used whenever possible. Alternate I fuels are most desirable if primary fuels are not available, with alternate II fuels and emergency fuels second most and least desirable. Table 1-11. Permissible Fuels 1-20