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Before I even got this reply it occurred to me that I hadn't accounted for the cost of the electricity. Although even without any cost savings there is still the added comfort and reduced emissions. So that's something anyways.
I'm reasonably certain there would still be a FE increase from using a block heater in warm weather as well, since the engine would not run as rich and would enter closed loop more quickly.
Then there's the fact that another surge in fuel prices would change the math on this significantly, and possibly make it profitable to run the block heater.
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