I have that page: http://www.4wdworld.com.au/tipstricks/fuelconv.htm
But it does not give the same result as what I used in my message on the page 1 of this topic. I should remake the calculations manually to see what is right.
When the car does not move, you cannot get a consumtion per km, you can only get a consumtion per hour (usually 1L/h)