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I used to be 1 quart per 1K miles but after I upgraded my turbos with UMW I have cut it to 1 quart per 2K miles. These are all city miles. On the highway I get closer to 4K miles per quart.
I used 2 quarts over a 1 year time span and 2100 miles. After that, I have used 1/2 of a quart and now have 3900 miles on the Turbo S. It is almost 2 years new.