Are Winchester people being taken for mugs?

Why are petrol prices so high in Winchester?  There seems to be a remarkable degree of unanimity amongst the petrol stations in the city about what is the right selling price, but if you drive a few miles away, then prices drop sharply.



On the outskirts of Romsey unleaded petrol was 129.9p per litre, in Gosport it was 128.9p, and in and around Southampton it was around 130.9p, but Winchester prices seem to be around 134.9p. 

Has someone been believing the tosh about Winchester being an affluent city, and decided to exploit us?  Had we a local paper that did its job properly then it would be asking some questions.