Avon front Trike tire started with 5/16" tread depth. I now have 15/64" tread depth at the most worn center. That took about 11,000 miles.
So if the wear continues the same, I will be down to 3/32" (which is usually where the wear bars are) in about another 22,000 miles...for 33,000 total.
Of course, that all depends on how I ride and what condition the roads are in.
These first 11,000 were a good mix of hot and cold, interstate and aggressive riding in the curves.
Kevin