Oh, and one other thing...

I may be completely wrong about one thing... 'petroleum-based' racing COULD be banned - and in fact for the Indy Racing League, it already has!

At its inception, they used methanol not gasoline (although I believe methanol is often derived from petroleum, it doesn't have to be). Furthermore, since 2005 they have been using 100% ethanol, except that for safety they went to a 98% mixture, since 100% ethanol flames are practically colorless and difficult to see and avoid.

so, in some respect, what you suggest is not only possible, but already in existence for the one of the most prestigious racing circuits in the U.S.!

I do stand corrected.

Now, to get NASCAR on board.

Castigat Ridendo Mores
(laughter succeeds where lecturing fails)

"Those who will risk nothing, risk everything"