Supermarket vs Motorway Services Fuel Prices
Fill up at a motorway service station and the number on the pump can look like a misprint. It is not. The gap between a supermarket forecourt and a motorway plaza is real, it repeats every week, and it is worth knowing the size of before your next long trip.
The short version
The fuel in the tanker is identical. What differs is who is selling it and what the patch of tarmac under the pumps costs them. Supermarkets use cheap fuel to pull shoppers in. Motorway services know you have already left the motorway, and they price accordingly.
Why supermarkets are cheap
Three things working together. Volume first: a busy supermarket island sells far more litres a day, so a small margin per litre still pays the bills. Site costs second: these forecourts sit on cheap retail land, not motorway junction land. And competition third: the big chains watch each other's local prices and undercut within days, which keeps whole areas honest. For a supermarket, fuel is a way to get you through the door rather than a profit centre.
Why motorway services charge more
Captive customers, for a start. Once you are off the slip road, the next pumps may be forty miles away. Plazas also pay some of the highest site rents in UK retail, and there is rarely a competitor in sight, so there is little pressure to chase the price down.
How big is the gap, really?
The size moves around with wholesale prices, but the motorway premium typically lands between 10 and 20p a litre against the cheapest supermarket in the region, and it can be worse on long, remote stretches. The tax content (52.95p of duty plus VAT) is identical everywhere, so every penny of the gap is margin and site cost. That is the part you can dodge.
The practical rules
Fill up before you join the motorway, not on it. Check prices along the route before a long trip; a two-minute town or postcode search covers it. And do not chase pennies: a 15-mile detour for a 2p saving costs more than it saves. Only gaps above about 5p a litre, on roads you were driving anyway, are worth acting on.
Are motorway prices improving?
Slowly, maybe. The Fuel Finder scheme obliges every retailer, service stations included, to publish prices, and published prices get compared. Comparison pressure has narrowed gaps at the worst sites before. Geography is not changing though, so the sensible move is to plan around the premium rather than wait for it to shrink.