IMO, changing the oil at 100 miles is excessive. I would change it before 1500, though. You'll see a lot of metal bits in the oil when it drains.
Also, it's not uncommon for an engine to burn oil during break-in. Half a quart over the first couple of thousand miles is not unheard of. After 4k or so, it shouldn't consume any excessive amount of oil.
Best of luck.
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