I have 99.6 hrs on my 2013 Kohler Courage 23 hp V-Twin, so far I don't see any oil usage, last month I did Change several times using different weight, Dino and Synthetic checking temperatures.
So I have only had one run of 50 hrs at change, at that time it didn't look like it was down any. I am now using Rotella T6 5W40 synthetic in it.
I also have a 2004 Briggs I/C series 17.5hp OHV with around 500 hrs and it will go from full mark to half way to add mark at 25 hrs, (it doesn't have oil filter) it has only had Rotella 15W40 since first oil change, it will puff a little smoke at start up)