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I used to block heat every single morning, but the gains aren't that great once you get out of winter. You can have a toasty engine, but say your wheel bearings and transmission... anything else that rotates and generates heat, is still going to be cold. You can run a block heater, plus perhaps an oil pan and/or transmission heater, but the time and energy it takes may not be worth the tiny gains you'll get.
Frankly, more and more reason to go full electric. I keep looking at my Insight as a great candidate... just waiting for that smug little 1.0L to explode.
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