The 20 and 21 800 sleds have been using more oil. I run them right beside the 18 and 19 sleds. It isn't twice as much after break in, but the range difference before light flashing has been around 20-30 miles.
Twice as much after break in would be a concern. Unfortunately, it isn't a simple adjustment with the electronically controlled pump. I'd verify the real usage and get on the dealer if it is double.