My Summit Center uses gas at a much higher rate too. I chalk it up to the six high BTU burners and high output side burner. I rarely have al six burners on high, maybe when I first light it, even then for just a few minutes. Most often I'm using only two or three burners on a much lower setting to keep it to 350 or so. But yes, when I have four+ burners going, and the sear burner, and the side burners, it sucks gas way beyond the Genesis grills I've used. I love it!
Marty