Sawtry Service Area, PE28 5XW. A motorway service area, where you have no choice.
What it is charging
Unleaded: 194.9p a litre, 23.2p over the national average, filed Friday 30 October
Diesel: 219.9p a litre, 21.2p over the national average, filed Friday 30 October
Super unleaded: 214.9p a litre, filed Friday 30 October
Super diesel: 239.9p a litre, filed Friday 30 October
Unleaded within 5 miles
Sawtry Fuel Express Automat: 169.7p a litre, 1.4 miles away. 25.2p a litre cheaper: saves £13.86 a tank, and costs about 54p of fuel to get there and back. Worth the trip.
K Cooper Motors: 169.9p a litre, 0.6 miles away. 25.0p a litre cheaper: saves £13.75 a tank, and costs about 23p of fuel to get there and back. Worth the trip.
On a 55-litre tank at 40mpg. The distance is straight-line rather than by road, so a real trip is longer than the one costed here.