Why is fuel more expensive at motorway service stations than at high street supermarkets?

I recently purchased diesel fuel from Messrs Road Chef via their Strensham North outlet located upon the M5 at £1.439 per litre. Incidentally the fuel purchased was 10.01 litres, which at £1.439 should have been charged at £14.40. The actual charge was £14.90. My recollection was that the pump price was displayed at £1.489 per litre.

On the same day I called upon Messrs Morrison at their Gamston (Nottinghamshire) supermarket and bought diesel fuel at £1.339 per litre. Is it not time that the blatant avarice being displayed at motorway service stations, who are all protected by their monopoly positions, was curbed? (Payment slips attached.)

Asked on 11 July 2011 by CB, via email

Answered by Honest John
You're right. On Saturday I paid £1.469 at Newport Pagnell on the M1. On Sunday I paid £1.399 at Barnsdale Bar on the A1 for the same Shell Fuelsave diesel. So it isn't the difference between branded and supermarket. It's the difference between the roads.
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