The system used to test electric cars should be overhauled because it exaggerates their range by up to a third, the government has been told.
Few vehicles can travel further than 200 miles on a single charge, despite many manufacturers advertising far higher distances.
Experts say that more accurate figures would help to address “range anxiety” — fears that the battery will run out of power too soon — and improve sales.
The government is committed to phasing out new petrol and diesel models by 2040. Some 17,393 pure electric cars have been sold so far this year, almost double the number at the same point last year. However, they make up only 1.1 per cent of sales.