I was alarmed at first but later was told that is was completely normal.

I have no mods at all and have 70000km. I do extensive track days (24 this year) and the car consumes 1 litre per track day or every 5000km street .
It doesn't puff blue or black and the plugs are perfect....so were does the oil go.?... beats me.

P.S. While we are on the subject I recommend that you set your oil level 1/2 between the marks...never full up...it will consume less at this level.