throwaway0010

Was curious, did the math: 3-5K gallons * 6 cyl * 25 mpg = 450,000 to 750,000 miles.

removed my incorrect math re: dollars of fuel per engine

It's not. This article is using the "American" definition of middle class, which most others refer to as "working class." Conflation between what we used to call middle class, and what we call middle class today is a huge source of confusion in pop economics.

http://en.wikipedia.org/wiki/American_middle_class

Only because lead paint is excluded from your statement by definition. It's already "emitted."

Getting rid of lead in gasoline is important because we consume a LOT of gasoline. We don't consume nearly so much Avgas -- it's about three orders of magnitude difference and as such it's a drastically smaller pollution source: http://en.wikipedia.org/wiki/Avgas#Consumption

If you're truly concerned about lead in the environment you'd be best served going after old structures with leaded paint -- not Avgas.