> Unleaded aviation fuels have been available forever True. But irrelevant if most aircraft cannot use it. > That certification helps people convert obsolete

> Unleaded aviation fuels have been available forever True. But irrelevant if most aircraft cannot use it. > That certification helps people convert obsolete aircraft Obsolete? Is a Cirrus SR-22 obsolete? > The federal government should outlaw leaded aviation fuels immediately and let the hobby aviation community figure out how to proceed from there. The government also uses planes. Whole industries use piston planes. And helicopters. Why are you singling out 'hobby' aircraft? Mind you, experimental aircraft have been able to use unleaded fuels (including automotive gasoline) for a while now. The reason most can't is that there were no fuels certified for use in their aircraft. Certification requirements come from the government, so the government has to fix it.