Petrol theft

I parked my car at Automotion as i always do when I travel for business. I have realised before that my petrol levels seemed lower but i wasnt sure. So this time i took pictures of the milage left on my tank and my odo. They drove 6kms which is fine, but the milage left on my tank was 50kms less. So ja beware... they remove petrol from cars.