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That's interesting that everyone seems to keep theirs plugged in. The instructions on the box when I got mine says to unplug it after every drive? So that's what I do. Granted my car is a weekend cruiser and I do not drive it often. I would say gas mileage is no difference with it.
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2015 Camaro Z/28 - Red Hot
1978 Trans Am Y88 Special Edition 400/4 speed
2001 Mecham Trans Am #3 - 7.0L LS1
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