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On March 9, 2026, the price of ultra-low sulfur unleaded petrol (gasoline) in the United Kingdom averaged 135.67 pence per liter. This compared to 149.01 pence per liter for diesel. Diesel prices were consistently higher than petrol/gasoline prices throughout this period, although the margin varied. Reasons for such differences in pricing lie in the refining process and molecular makeup of the products, with diesel requiring more complex refining processes and being an overall heavier liquid. As motor fuel pricing in the UK is not regulated by a monitoring body, there may also be notable differences in prices between retailers and regions.

Supermarkets provide lowest fuel prices in the UK

In the UK, much of the motor fuel is sold through supermarkets. Large supermarkets, or hypermarkets, account for more than 40 percent of all motor fuel sales in the country. The reason for their popularity often lies in the fact that they offer lower average prices. In the last four years, regular petrol/gasoline sold at supermarkets was up to six pence per liter cheaper than the national average.

How UK fuel prices compare to the rest of the world

Tied as they are to crude oil prices, motor fuels are generally cheapest in major producing countries, such as Iran, Venezuela, and Russia. In Europe, costs of importing the raw or finished products, in addition to taxes and levies, may hike up pump prices significantly. The UK is often among the countries with the highest petrol/gasoline prices, alongside other large European car markets such as France and Germany.