Deliveries of gas cars were down over 20%, too, with hybrids taking up a lot of the slack. Diesel is also struggling.

Tesla’s sales in the European Union slumped for a fourth consecutive month as Elon Musk’s electric-vehicle maker struggles to cash in on a growing EV market in the bloc where Chinese rivals are expanding.

Tesla's sales in Europe fell 49% in April from a year earlier, even though battery-electric car sales rose 27.8%, as the U.S. EV maker's upgrade of its Model Y shows little sign of reviving the brand's fortunes in the region.