Giant waste of power. Only if you are driving somewhere immediately upon retrning and the weather is -50 outside, plug it in for a couple of hours.
Wait...actually...heres my pet peeve...what is it you all think a block heater does? I'm curious to know...not necessarily the OP here, but the way people talk about plugging in their cars being necessary for it to start in even mild winter weather...what exactly do you think it does? I know what it does having installed...well hundreds of them in brand new vehicles. And for the record I never plug my truck in.
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