I just took a 1400 mile trip and used a quart of oil. Using the car for work, hardly any oil is used in 1400 miles. The only difference was the trip was mostly over 3000 RPM but it rarely goes much over 2500 RPM going to & from work. This has happened twice to me, once on synthetic & once on dino. Called Nissan dealer and they said that a quart/1000 miles can be considered normal. Car is a 02 SER with about 30000 miles.