Subaru says that 1 quart per approximate 3000 miles is within normal specs. Anything more than that can be considered excessive. I honestly would expect some oil burn on the highway (mid-range rpm w/ load for hours on end). But 1 quart in 1200 miles is a bit much. Possible causes of oil burning would be a bad turbo seal or a blown piston ring (blow by from the crankcase).

If the oil smells strongly like gas, you might have a bad piston ring.