Surprised that you don't
Surprised that you don't consider it a major issue when you paid for a new car, and the oil usage is more akin to a very well worn one. Keeping in mind that the oil usage issue is to do with piston rings wearing, confirmed to me as the reason by my dealer when they replaced them under warranty in my Subaru Forester. If your oil usage is so much after 16,500 miles, how much worse might it be in another 16,500 miles. The oil usage you quoted of one quart per 1500 miles is more than a sump full between scheduled services. That is ridiculous oil usage, not acceptable. If people are prepared to put up with this, just accept this, then Subaru Japan, or Subaru America, will likely not do too much to fix the problem.