There is G100UL which seems to be promising as a 1:1 replacement for the current 100LL. Though regulatory inertia seems to be delaying a large scale rollout: ht

There is G100UL which seems to be promising as a 1:1 replacement for the current 100LL. Though regulatory inertia seems to be delaying a large scale rollout: https://www.avweb.com/insider/faa-continues-to-stall-on-g100ul/ https://www.avweb.com/insider/faa-continues-to-stall-on-g100... I'm not aware of any experiences of G100UL with warbird engines.