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Q:

excessive oil comsuption on 2007 Chevrolet Suburban 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
brought new every 400 miles 15% is burning oil no leak engine sounds like old car now is 38000 problem is worse.
(1) Answer
sounds like you may have a broken oil control ring on a piston or some other issue. that a lot of oil in a short period.
i would have a shop do a wet and dry compression test to verify.

Roy