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Old 12-09-2010, 05:05 PM   #12 (permalink)
brucey
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Join Date: Mar 2008
Location: WV
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Pequod - '17 Subaru Outback
90 day: 22.79 mpg (US)
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I feel, once the cost of electricity is factored in we're not saving a lot of money, and I wouldn't be surprised if it's a wash for some folks.

That said, I plug in whenever I remember I'm going somewhere. The warmed cabin, no high idling, relief on the engine/alternator, warmed oil, etc is worth it. The MPG boost is just a bonus.
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