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My experience with a block heater is it makes a big difference even when used for just 10 minutes. No you won't get instant heat with it but your engine will warm up to operating temp much quicker. Another thing you can do is start the car with it plugged in while you scrape the frost from your windows. Any way you look at it you come out ahead, electricity is cheaper, you save your engine from some wear, and you save fuel.
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