[spullara]

There are a bunch of references in this article though I can't find that exact statistic:

http://www.edmecka.com/Forms/tfc_calm.pdf

Oh, on page 158 they claim it is more like 40 lives lost per 1 life saved in Austin, TX.

[JshWright]

That's not based on any actual evidence though... Just a bunch of (somewhat dubious) assumptions piled into a theoretical analysis.