My 200tdi with immobiliser and clock (radio off) draws less than 30mA. Can't remember the exact figure but will check if helpful. I had similar charge-loss problem at one point which I cured with a new battery
Old battery was losing charge and after a while wouldn't start the Landy
New battery didn't lose charge and I have had no problems since I changed it
Current draw was the same with both batteries but the old one couldn't keep up with it