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I have a 2007 Impreza Hatchback with the non-turbo charged engine with 130,000 well maintained miles.
The oil consumption is about 1/2 qt. every 1,000 miles. I changed over to high mileage 10W/30 conventional grade motor oil which reduced the consumption by a 1/4 of a quart.
There is a very good article in Consumer Reports Magazine about the oil consumption issue with several manufacturers. In brief it comes down to engine design. In an effort to get better fuel economy the piston its self and the piston rings are designed to reduce friction which leads to some oil consumption. The article in Consumer Reports from either 2015 or 2016. Check with your local library.