Peter, one of the products I came across does contain TEL "tetraethyl lead"and also mentions that it is environmentally safe and EPA registered.
IS LEAD SUPREME-130 SAFE FOR THE ENVIRONMENT?
By adding Lead Supreme-130 to your fuel, your engine will perform better by increasing horsepower and burning the fuel more efficiently. Practically all the lead content is burned and deposited on the valves and valve seats, leaving the environment virtually lead free. The sun quickly decomposes any remaining trace of lead.
HIGHLIGHTS OF LEAD SUPREME-130
1. The only product with 100% Tetraethyl Lead and other octane enhancing components (No substitute chemicals added).
2. Boosts octane from 2-16 points when added to fuel. Perfect for HIGH COMPRESSION ENGINES. Eliminates engine knocking.
3. Protects valves and valve guides.
4. EPA registered.
5. Environmentally safe
6. A superior gasoline treatment.