I dread taking my car to a mechanic because I always walk away feeling like the mechanic over diagnoses me, overcharges me or treats me like an idiot. Junior's was the opposite. Very friendly and interested in my car.

Last week was a difficult one for Tesla. After the carmaker waged a public war of words with federal safety regulators, CEO Elon Musk picked a Twitter fight with a magazine and may have improperly revealed financial information.

Like its non-M sister, the M8 is what more people would tend to think of as a sedan than a coupe, having four doors and—in a serious pinch—five passenger spaces. But...

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