This suggests that a reaction from consumers who dislike Mr Musk’s antics are only one reason for falling sales. An updated Model Y, Tesla’s best-selling vehicle, has just gone on sale. In preparation Tesla ran down inventory of the old model, crimping supply. Customers doubtless held off purchases until the new car was available.

With Chief Executive Elon Musk playing a prominent role in the Trump administration, many Tesla drivers are no longer happy about supporting the car brand.