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After calculating the cost of electricity a block heater plugged in overnight is highly ineffective as well, this will only cost you more on the utility bill than gas money it saves. And unfortunately it has to be left on over night or it doesn't work.
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yea.. that's wrong. even more so if you get a timer to have it start at 4-5am so you can leave at 7. electricity is much cheaper than gasoline. Most block heaters heat it all the way in 1-3 hours.