I always reckon my Bubble Stove will use between 6 to 8 litres over 24 hours. This is running on a touch above no 1, and maintains a good ambient temp around 24o in the saloon, and feeds a small rediator in the bedroom with a radiator.
As a professional technician of vaporising appliances, I would dispute the minimum figures of 1.12 cc min. That amount of fuel would not keep the pot at a sufficiently high temperature to maintain vaporisation.
The calorific value of diesel will give you about just under 11kw per litre, so 1/3rd of a litre per hour will give you 3-4 kw, which fits in with your quoted ambient temperatures.