most manufacturers wont investigate high consumption until over 1 litre /1600 km. while it seems high, its not outside what they would class as normal. Couple of things to watch, Make sure visually its not leaking, and check the tailpipes for any sign of oil, give it a good boot full through the gears (accelerate hard) and see if she's chucking smoke out. With all the signs checked, continue to monitor.
