I'm certainly as subject to error and false belief as anyone else, but
this being a discussion forum I thought I'd toss in what I think I know.
No doubt others have strongly differing opinions, and are welcome to
them. Most of what I offered is subjective except the figures on lead
content, and I took those from a couple of refineries' sites and the EPA
site - I judge middlin' reliable sources.
The core issue of this discussion thread is addressed unambiguously by
EPA regulation, excerpted here from their website:
"Prohibition on the Use of Leaded Gasoline in On-Road Vehicles. Section
211(n) of the 1990 CAAA states: 'After December 31, 1995, it shall be
unlawful for any person to sell, offer for sale, supply, offer for
supply, dispense, transport, or introduce into commerce, for use as fuel
in any motor vehicle (as defined in Section 219(2)) any gasoline which
contains lead or lead additives.' This provision applies only to on-road
vehicles. Enacting regulations were promulgated [61FR3837, February 2,
[excerpted from http://www.epa.gov/grtlakes/bns/lead/steplead.html , para
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