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I’ve had mine for almost a year now and no problems at all. Just make sure you get one with the most current firmware and you should be trouble free. Took it out the other day just to see if I could feel the difference...and I definitely could! I don’t think I’ll take it out again unless I’m taking my car in for service. On long trips where you are going long stretches at freeway speeds you might see a little mpg gains, but around town no change.
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