The Ecopia's have a rating of 600 A A over on tire rack. That would suggest that it lasts 6 times as long as the "100" treadwear test tire; generally speaking, anything 500 or higher should last about 80,000 miles under the controlled conditions - but in reality, it'll be less than that. My Outback had Continental Contiprocontact which is rated at 540 but had to be replaced around 45,000 miles. I also drive about 3/4ths city, and 1/4 highway.
Since I'm leasing, my expectation is that it'll be a non-issue, since the lease is done in 36 months and 36,000 miles.