ʻOku hoko ʻa e lolotonga ʻi loto ʻi ha ngaahi fakangatangata pau, tautautefito ʻi he ngaahi fakangatangata ʻo e maumau.
Ko e ngaahi fakangatangata ki he CH4 ʻi he ʻea mei he 5% ki he 15% methane tokanga. ʻE hoko ha fakaʻauha kapau ʻe to ʻa e volumetric ʻa e methane ʻi loto ʻi he 5% ki he 15% ngaahi meʻa kehekehe pea haʻu ʻo fetuʻutaki mo ha ulo ʻoku ava.