I think the factory heater is 400watts and it'll only need 2-3 hours if your temps aren't too severe. You can buy a cheap timer and program it to come on before you have go to work or whatever and the cost is very little, maybe $0.10/ heat cycle.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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