Travelling at Christmas - avoid high priced service stations How expensive is motorway fuel? "Rocket and feather" strategy for motor fuel pricing. More Posted: 191205 The petrolprices.com website highlights motorway service stations tend to make the most of their pricing and captive audience, but on average they are 14% more expensive for fuel, but what may surprise some is they can be up to a whopping 135% costlier than a supermarket for snacks. That’s quite a markup. The petrolprices.com news item has a list of the stations they regard as the places to avoid. List