Tesla's bumpy relationship with Consumer Reports exposes a bigger challenge

How do we judge Tesla’s progress over time?

Tesla, unlike other automakers, doesn’t have traditional model years. The predictable schedule of small annual updates between major refreshes isn’t part and parcel of Tesla’s DNA, nor its hardware.

Instead, the tech-centric company regularly updates software to improve or add performance and safety features in its electric vehicles. These wireless over-the-air software updates are a selling point to consumers who see value in, and are willing to pay for, a vehicle that theoretically improves over time.

Tesla is judged more like a student — in marking periods, at the discretion of its critics. The recent nick and partial restoration of Tesla’s standing with Consumer Reports is more than just...

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