The General Motors co., in the form of its OnStar LLC subsidiary, would like you to hie yourself to your nearest best buy and plunk down $300 for a new rearview mirror for your car. No, this isn’t a sneaky grab at another bailout, but rather the distilled marketing premise of the recently launched OnStar FMV (For My Vehicle), an enhanced rearview mirror that offers many – but not all – of the

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