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I don't know if some one mentioned this but the best environmetal method is to use car engine pre-heater (electricity) and drive straight away after starting. The car is allready warm and the emissions are low. It can be combined with a cabin heater so that you enter a warm car. Just 1hour of prewarming is enough! I used it a lot when i lived in Northern Sweden but do not see the need for that in southern Sweden since there are not mnay days when the temp drops to minus 10C in a year.
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