Ya gotta love a discussion that just never ends...

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=7
     "WARNING: These calculations (and those provided by all online tire
dimension calculators) only reflect nominal tire dimensions, which are
often subtly or substantially different than the tire's actual physical
size and/or the dimensions provided by the tire manufactures."

Euro-Metric tire sizes like 185R14 are 82 aspect ratio.  185/80R14 is a
later sizing standard, not the same.
http://www.tirerack.com/tires/tiretech/45_conversionchart.html

A sampling of some manufacturers' published 185R14 revs/mile data:
Kumho 857                 817
Yokohama Y356 D           809
Yokohama Y356 C           808
Continental Vanco 2       811
Nokian Hakka C Van/Cargo  817
Hankook RA08              811
The spread between the smallest and largest is 9 revs/mile, a bit over 1%.

Tires change size throughout their useful life as the tread wears.  You
can't expect much in the way of precise specifications for something
with this much variation in size.