The last major detailed (moreso than the census bureau) survey concerning
personal autos appears to have been 1995.
Pre-81 cars make up a modest (15%) portion of the total vehicles driven by
low income households.
CTA shows the total vehicle miles driven as a % of the whole drops to under
1%/yr after about 20 yrs of age. see p. 31 of
http://www-cta.ornl.gov/npts/1995/Doc/Envecon.pdf
Ms. Dill has the following document which appears to advocate what she calls
voluntary accelerated vehicle retirement (vavr):
http://trb.org/trb/publications/ec026/23_dill.pdf
b4 taking pen to paper, it would probably help to review one or both these.
these papers also document the OPPOSITE notion of "they don't make them like
they used to" ... or that we've become a throw-away culture --
as time passes, vehicle longevity increases--a debate in itself, maybe (CTA
offers add'l or alternative explanations to increasing auto quality)
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