The average price of diesel in Britain hit £2 ($2.64) a litre for the first time on Friday, according to RAC data, the latest landmark in a global surge in fuel prices.
The UK-wide average reached 200.01 pence, up from 199.79p on Thursday. Prices passed the previous high of 199.09p on Monday. That record was set in June 2022, shortly after Russia's invasion of Ukraine.
RAC head of policy Simon Williams said the rise was "showing no signs of slowing."
Hours later, G7 countries agreed to release 100 million barrels of diesel and crude oil from their strategic reserves under pressure from the United States. The release will begin immediately and run over four months, with a frontloaded diesel release in the first 20 days, coordinated through the International Energy Agency.
Earlier in the day, European Union countries had discussed a French proposal to release diesel stocks in response to US pressure to help cool prices. French President Emmanuel Macron, the current G7 chair, said the group wants to trigger a drop in fuel prices.
Fuel costs are a key driver of UK inflation, which hit a five-month high in August, adding to pressure on households already facing a prolonged cost-of-living squeeze.