With a 7k change interval and a good amount of highway driving I'm surprised it doesn't use more oil. As for myself, I switched away from that watery 0W-20 after warranty to 5W-30 and also would never run the 0W-20 for 7k miles. I didn't like the looks of it after 4500 -5000 miles. Not criticism but just my opinion as everybody can do as they choose.
I've always been skeptical of the thinner oils and increased timing chain wear. It's interesting that the latest GF-6 oil formulations address timing chain wear. To me it almost begs the question of what wasn't made known earlier in the game and why so late in the game to address it.