Arlen Holder wrote:
> On Fri, 18 Dec 2020 16:20:42 -0600, Paul in Houston TX wrote:
>
>> IMO, mileage estimates seem to be for straight line, 50 mph, constant
>> temp and load.
>
> While the manufacturer stamps the tires with the treadwear indicator, they
> do so following an exacting driving procedure handed to them (AFAIK) by the
> DOT and/or the NHTSA to be run always on a specific San Angelo TX test
> course always with a specific driving pattern for all tires being tested.
>
> Let me dig that test track information up...
> o <https://one.nhtsa.gov/DOT/NHTSA/Vehicle%20Safety/Test%20Procedures/Associated%20Files/TP-UTQG-W-01.pdf>
>
> That document is labeled "TP-UTQG-W-01" US DOT NHTSA
> o "Procedures for tire treadwear testing"

Thank you for all the links. The test track info was interesting to me
in that I have driven all those routes several times. About the only
tire hazard there is the occasional armadillo.