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I get the impression one or some of you are thinking of using block heaters to prevent the engine from cooling down overnight, instead of letting it cool down then heating it briefly before you go the next morning... well, DON'T!
It will take more energy to maintain that warmth all night than it will to warm it from cold in the morning. Why? Because the greater the temp differential between object (engine) and ambient temp, the greater the heat transfer (loss). So the most efficient way to use the block heater is to know how long it takes for it to warm the engine from cold to as warm as the heater is going to heat it, and turn it on that long before departure.
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