At first, I set the heater to be ready about 15 minutes after my planned departure, now I have set it to around 30 minutes later. There is still good heat in the compartment and the engine sits at around 70 degrees. This saves an estimated 0.2 litre of fuel every time the heater is in use, based upon a 0.4 to 0.5 litre/hour for the heater. I expect the heater to add between 0.3 and 0.4 litre per 100 km, so not a lot.
The heater that starts with the engine only, when the temp is below 5C, shouldn't add much at all. My Mondeo that I had previously used virtually the same amount of fuel summer as winter, and it had a heater that fired with the engine on cold days.
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