I've noticed my '04 Wee uses oil as you describe but I've got 99.5K miles on the engine. I usually carry a 1/2 liter bottle of oil with me on extended mile trips.
GW suggested that a full oil fill on the site glass, as seen on the centerstand, would be at the top of the glass.
I start that way and if it drops to below the center of the glass, I add some.
After hours at 70+ mph the level drops. I don't notice an overly sooty tailpipe and it doesn't feel greasy, I don't have oil spots on the ground where I'm parked so I don't worry about it.
Last edited by notacop; 03-06-2019 at 06:44 PM.