UK drivers running battery electric vehicles are now saving more than £1,100 a year in fuel costs compared with petrol equivalents, according to new Carbon Brief analysis. Collectively, the country's EV fleet is keeping roughly £3bn in drivers' pockets each year — and the savings are landing just as the government considers softening the rules that got those cars on the road in the first place.
The conventional industry line has been that EV targets are running ahead of consumer demand. The numbers tell a different story.
Carbon Brief reports that more than two million battery EVs, one million plug-in hybrids and 100,000 electric vans are now on UK roads. Between them, they are avoiding nearly 2.5 billion litres of fuel use annually and cutting carbon dioxide emissions by close to seven million tonnes a year.
The driver of those savings is efficiency. Battery EVs are roughly four times more efficient than combustion-engine cars, the publication notes, a gap that widened after the Iran crisis pushed up fossil-fuel prices at the pump.
Despite that, the government is set to consult on weakening the zero-emissions vehicle (ZEV) mandate. The current target requires 80% of new car sales to be battery electric by 2030. BBC News reports ministers are considering dropping that to somewhere between 50% and 70%, following lobbying from carmakers and trade unions.
According to Carbon Brief citing the Sunday Times, Prime Minister Keir Starmer reportedly overruled Energy Secretary Ed Miliband following pressure from industry, the Unite union, and Business Secretary Peter Kyle.
The awkward part: manufacturers have been over-complying with the existing mandate, partly by using flexibilities that let them count plug-in hybrid sales toward their targets. And plug-in hybrids are where the savings story gets thin.
Real-world data shows less than a third of miles driven in PHEVs are actually powered by electricity — the rest runs on petrol. The 2023 Conservative government consultation on the ZEV mandate reportedly noted that PHEVs do not deliver the advertised cost and CO2 savings, pointing to dramatic gaps between test results and real-world performance. Carbon Brief's analysis puts the savings from a battery EV at more than three times those of a plug-in hybrid.
So a softer mandate would likely mean more plug-in hybrids on the road, fewer battery EVs, and a smaller dent in both household fuel bills and national emissions.
The wider question is who benefits from slowing the transition. Drivers are saving money. Emissions are falling. Manufacturers are meeting their targets. The pressure to weaken the rules is coming from the companies being asked to change, not from the people buying the cars. That's worth keeping in mind the next time claims of insufficient demand get cited as the reason the UK can't move faster.
