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How diesel drivers can save money as Iran war puts £400 on annual bills

Motorists facing the highest-ever diesel prices in the UK

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A diesel fuel pump at a petrol station in Coventry. The average price of a litre of diesel in the UK has hit an all-time high, passing the previous record set in 2022, RAC figures show. Picture date: Tuesday September 29, 2026.
Diesel has hit a record high price in the UK. Picture: Alamy

By William Mata

The price of diesel has hit a record high due to the ongoing Iran war, and British owners are reportedly paying an extra £400 per year.

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The average price of a litre of diesel in the UK has hit its highest-ever record of 199.18p, it was reported last week, and could climb well beyond the £2 threshold.

In response, the government has stressed the "diversity and resilience" of its diesel supply and has also denied reports of a 50mph speed limit to cut use or that it was rationing fuel.

A spokesman told LBC: “We have a diverse and resilient supply. We continue to engage with our international partners and the UK fuel industry.”

A survey by WhatCar this week found that an 8,000-mile-per-year use of a car would result in an extra £400 being spent by diesel car drivers.

However, even with diesel costing more than ever, it is still possible to save money.

Read also: Refunds due to some people who have previously been dealing with problem debts

London, UK. 25th Sep, 2026. General view of diesel and petrol prices at a Shell station. The price of diesel has reached a record high due to the war in Iran. Credit: SOPA Images Limited/Alamy Live News
Diesel and petrol prices at a Shell station in London. Picture: Alamy

How to save money on diesel

Driving at 40- 50 mph

The RAC has found that driving at 40- 50 mph is the most fuel-efficient speed to be at.

Switch off air conditioning

Blasting air-con can feel nice, but the AA has found that consistent use can also increase fuel consumption by 10%.

Extra weight uses up fuel

Carrying more items than you need within the car can also cause it to use more fuel, as the engine is put under more pressure to reach the same speeds.

One item that can quite easily go to make a saving is an unused roof rack, which can additionally make a car less aerodynamic.

Check tyre pressure
Keeping tyres well topped up is a money-saving technique. Picture: Alamy

Tyre pressures can make savings

Keeping tyres at their correct pressure can be another way to save. You can find out what pressure to maintain your car's tyres at in the service manual.

Speed up and slow down gradually

Acceleration is where fuel is used most quickly, and savings can be made if you speed up and slow down more gradually.