Motorway Services vs. Supermarket Fuel: Where UK Drivers Really Save

It is well known that motorway services charge more for fuel than almost anywhere else. What is less obvious is exactly how much more, and whether coming off the motorway to save money actually pays for itself once you account for the extra time and distance.

The gap is bigger than most drivers expect

Motorway service stations routinely price 15-25p per litre above the UK average, and sometimes more. On a 50-litre fill-up, that is £7.50-£12.50 difference against a supermarket forecourt — often for fuel from the very same refinery.

Why services can charge more

Captive audience economics: once you are on the motorway and running low, leaving at the next junction to shop around costs time you may not have. Service stations price accordingly, and rents/logistics at motorway sites are genuinely higher too.

When the detour is worth it

If a supermarket forecourt is within a couple of minutes of your exit and you need a reasonable amount of fuel, the saving usually outweighs the extra few minutes. If the nearest cheap option is 15+ minutes off-route, the maths gets much closer — and running low with no clear plan is worse than paying the premium.

See both options before you commit

The useful comparison is not "motorway services vs. supermarkets" in the abstract — it is the actual prices at the actual stations near your actual route, right now. MyRoadMate shows fuel prices for stations along your route, on and off the motorway, so that decision takes seconds instead of a guess.