After a short period of falling prices, fuel costs are climbing again. The RAC says the latest rise follows the resumption of US bombing raids in Iran and tension over the Strait of Hormuz, with further increases expected. Petrol now averages 159.55p a litre, while diesel costs 178.31p. In December 2025, the average prices were 134.97p for petrol and 142.57p for diesel.
With summer holidays prompting longer car journeys, motoring experts have highlighted an unusual tip to help drivers use less fuel: place an open bowl of water on the passenger seat.
Why a bowl of water helps
The advice comes from motoring experts at ChooseMyCar.com, who say the water acts as a visual reminder to accelerate and brake gently. They said:
"Keeping an open bowl of water on your passenger seat is a great deterrent for unnecessary acceleration and braking. It sounds a bit strange, but it is a simple and brilliant reminder to drive gently. If you hit the accelerator too hard, you'll see water pour out the sides. Likewise, if you're driving too fast and braking hard you'll notice water on the seat. The best bowls to use for this are small cereal bowls, with water about an inch from the top."
More fuel-saving advice
Use your garage as an actual garage: keeping the car warm inside a garage helps maintain a better temperature for fuel economy and cuts the need to use air conditioning to heat or cool the vehicle, especially in cold December weather.
Empty your car out: carrying excess weight burns more fuel. Drivers are advised to clear heavy items out of the car regularly, such as remembering to take golf clubs out of the boot before driving to work on Monday.
Just don't do it: walking or cycling instead of driving saves fuel and could mean cancelling a gym membership. For example, a five-mile commute would save £416 a year and add 10,000 steps a day.
