Re: 100 octane low lead fuel ok? Home › Forum › Ask A Member › 100 octane low lead fuel ok? › Re: 100 octane low lead fuel ok? amullerReplies: 1055Topics: 163 September 11, 2017 at 10:12 pm #64702 As people have said, no advantage. Plus there are health and environmental consequences. 100LL can have up to 2 gm/gal TEL, which is really nasty stuff….