What fuel is best to use?

[Robert Bergeron]

David/ Phil , you are both right on the spot with the Avgas issue for high compression super-charged engines . My engine is a low compression version and it used to thrive on 80-87 Octane leaded Avgas ( Red) . It contained four times less lead than today's 100 LL ( Low lead) Avgas ( Blue ) . Warbirds used to run in 100-130 Octane Avgas ( Green ) . Those were the days ! Still, for HMV's 100 LL Avgas mixed 75-25 with Shell V Power Super Unleaded with no Ethanol crap is the best way to go : Lead to lubricate the valves , NO vapour lock and long long lasting in the tanks. Works perfect in my Continental C-145 2H air cooled windmill . Cheers . Thanks for adding to the discussion .