I think at least all models of the Cirrus, one of the best selling general aviation planes right now, require 100 octane gas. To be clear, none require leaded

I think at least all models of the Cirrus, one of the best selling general aviation planes right now, require 100 octane gas. To be clear, none require leaded fuel, per se, but until this year there was no approved unleaded 100-octane fuel.