Supermarket fuel was 3.2p a litre cheaper on 14 July 2026

Supermarket forecourts were consistently undercutting the national average petrol price on 14 July 2026, and for drivers watching every penny at the pump, the gap was worth paying attention to. Official UK fuel price data covering more than 7,800 forecourts showed the average price of E10 unleaded at 151.4p a litre on that date, while the same fuel at supermarket sites averaged 148.2p a litre across nearly 1,500 locations.

That 3.2p difference might not sound like much in isolation, but it adds up quickly once you work through a full tank. On a 50-litre fill, you would pay roughly £1.60 less at a supermarket than at a typical non-supermarket forecourt. Do that twice a month and you are saving close to £40 a year purely by choosing where you stop. For drivers covering higher mileages, the saving grows further still.

Diesel was considerably more expensive than petrol regardless of where you filled up, with the national average at 165.0p a litre on that date according to the same official data. Diesel drivers therefore face a higher base cost, which makes the choice of forecourt even more relevant if they are trying to keep running costs down.

Every fuel price figure in this article is the official reading for 14 July 2026.