That'll be why then, even if you're not totally thrashing it, it'll still use the oil, and I used to let mine warm up before driving, used expensive oil, I always check mine anyway, but aslong as there's no visible leaks, my next door neighbour has a 4efe'd corolla and his uses alot of oil, due to him being heavy footed. Just keep an eye on it, try and work out roughly how much it is using, try different styles of driving maybe? If there's any drastic loss thats when you need to start worrying. Damien