yea, thats pretty accurate, i normally burn 1 quart every 3k miles.. but the first 1-2k after an oil change i dont burn much.. then all of a sudden ill be 1/2 quart low after a tank.. thats when i know its time to clean or replace the PCV valve, i really dont show much sign of losing oil though.. no discolored exhaust, i do have a very slight film of soot around the oil filler cap, but its almost not even noticable.. tried replacing it twice.. hasnt worked.. so i just keep an eye out