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A lot of Prius owners use them in the colder states. It can make quite a difference if your morning commute is cold enough. Between the block heater and grille blocking I'm sure you'll see a gain. Now whether this enough to offset the electricity use or not is another issue. It's sort of like the plug-in hybrid debate as to which is cleaner as well but the idea that it may make your winter commutes more satisfying could trump every other concern.
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