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still plugged in

  1. When fully charged but still plugged in, is it still costing KWh $$$ ?

    Newcomers to GM-VOLT.COM (See here for FAQs)
    I read that the Volt should always be plugged in (something about keeping the battery at the correct temperature, especially in hot and cold weather). So, if it is already fully charged, is the electric company still charging me because it is plugged in? Thank you in advance! This forum is great!