I think I add a quart every 300-400 miles? I went through 2 over the 800 mile trip. I check the oil every time I fuel, right after shutting the bike off, and top off if the level reads low. At worst, it may be 1/8 to 1/4 down. Sometime not at all.
I have an oil pressure gauge, which also reads predictably, about 10psi per 1k rpms at operating temp.
I'm planning to go through the top end this winter and replace all of the seals. Like I said, the engine isn't wet or blowing oil all over me, just a little seeping in the front below the pucks, and a thin film on the bottom. My exhaust will occasionally have a tiny puff of blue smoke at acceleration, but nothing else to suggest it's burning a bunch of oil.
It's somewhat of a mystery to me, but it seems predictable enough and the bike runs well, so I'm just babying it through this riding season.