Looking for a big problem is always an honorable thing to do ... however, this sounds increasingly like something simple ... i.e. one valve stem seal, etc ... not likely there is a major ring issue ... as one of the other posters noted, 800 miles per quart is considered within "normal" range for some manufactuers ... people don't like to hear it, but it has held up in court.

My wife's suburban uses about a quart every 1200 miles ... has from day one to now with about 60K on it ... runs extraordinarily well ... just uses a bit of oil.

Drive it hard for a 1000 miles, then start religiously tracking oil usage.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg