Sales of electric vehicles in the United States hit an all-time high in the third quarter. Normally a welcome piece of news for EV makers, the record was prompted by the end of tax incentives for EV buyers, which expired at the end of September. From now on, it’s likely to be bad news for car companies with EV plans. Kelley Blue Book reported sales of electric cars in the quarter to September shot up by 40.7% on the previous quarter and by 29.6% on the year. This trend pushed the average car price for the third quarter of the year to over…