abdg
from a toxic point of view, the AVGAS is less harmful than most of your unleaded mogas.
The G100UL is as best I can tell is no worse, however it will be far healthier for your engine.
The only thing TEL does in AVGAS is create a stable octane rating. Lead does nothing else positive and only helps clog up your engine, especially those who do not use the red knob properly.
The sooner it is gone the better. Should not be long anyway.
