The RAC has warned that average petrol prices in the UK could rise to 150p per litre, if oil prices remain at $100 per barrel.
Average petrol prices are currently 137.5p per litre, while average diesel prices are 151p per litre.
Prices have risen by 5p for petrol and 9p for diesel since the first attacks in Iran on 28th February.
The RAC said that diesel prices have seen the fastest increase since the start of the invasion of Ukraine.
Simon Williams, head of policy at the RAC, said: “Average petrol and diesel prices have rocketed in the last week and are unfortunately likely to keep on rising, so the situation for UK drivers is looking increasingly bleak.
“Unleaded is almost certainly going to reach an average of 140p in the next week or so while diesel looks highly likely to climb to at least 160p a litre.
“The price of diesel is increasing more quickly now than at any point since the start of the Ukraine conflict.
“With oil at a sustained $100, petrol could rise towards 150p a litre – a price not seen since June 2024.
“Diesel could reach almost 180p, which would be a three-year high.
“We encourage drivers to continue filling up as normal but to shop around for the best prices using apps like myRAC as there can be big local differences between forecourts.
“Driving fuel efficiently by avoiding harsh accelerating and braking and ensuring tyres are inflated to the right pressures can help eke out every last mile and save money.”
Lobby groups such as FairFuelUK have called for an extension on the Fuel Duty Freeze, which is scheduled to end in September, to ease costs.
John Cassidy, managing director at Close Brothers Motor Finance, added: “The spike in fuel prices caused by the conflict in the Middle East has been a bolt from the blue for everyone – not least the nation’s drivers.
“It’s heaping further pressure on motorists at a time when the cost of driving is already elevated, through insurance premiums, tax, and maintenance costs.
“Calls for drivers to consider cutting non-essential journeys and change driving styles to conserve fuel risks preaching to the converted.
“Our own research conducted prior to the market shock showed that half of drivers (49%) were already driving less often to save money on fuel – using public transport or walking and cycling more.
“Should elevated fuel prices continue into the medium to long-term future, government support should be considered to reduce the shock impact on the personal finances of motorists, with so many livelihoods and businesses relying on vehicles to make ends meet.”
