I had a brief introduction to some of this when I did my thesis on automotive emmissions gas sensors. But, am not a chemist, so I can't effectively argue it one way or another.
The other two points the chemist made made were that if it worked there would be papers describing its operation and the carmakers would be using them.
The other chemist at work said that there is a big difference between lead in formulated gasoline and tin solids in gasoline.
It is not important enough to me to research or discuss it any further. If it is to anyone else, I recommend a literature search at your local library.
