I get about 22,500 miles out of a set of tyres but I am very gentle on tyres as I do little braking (my current brake pads have done 60K, they were on the car when I got it and they still don't need replacing) and I am not a spirited driver on bends, though I can be.
The legal minimum tread depth in the UK is 1.6 MM. I believe that's alot lower than many other nations as we don't get as Extreme weather's. Europe's old tyres get sold to the UK and are resold very cheaply as "part worn" tyres.
I find speeding up after slowing for a bend a waste of fuel/energy, and as I drive good handling cats, I always try and maintain a good speed through corners. This probably contributes to my excessive tyre wear somewhat.
It would appear many European countries use the 1.6 rule, however certain countries have different summer/winter rules. For example Norway require 3 mm minimum during the winter months.
Tread depth requirements vary by state. Here in Texas it is 2/32 or 1.6mm while in Loonville, California for outsiders, it is 1/32 or 0.8mm. Some use coins to measure. The gap to the top of President Lincoln's head on the penny is 2/32 and the gap to President Washington's head on the quarter is 4/32. Some people have adopted 4/32 as their own personal tread limit gauge for added safety. If you can't trust the father of the country who can you trust?
A classic way to measure winter tire wear is to use a quarter. Insert a 25¢ Canadian coin in one of the grooves with the Caribou facing down. If you see the tip of its nose, it means the tread depth no longer meets 6/32”, so the tire probably won't last all winter or 10,000 km.
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