Shell Cullompton, EX15 1NS. A motorway service area, where you have no choice.
What it is charging
Unleaded: 172.9p a litre, 1.2p over the national average, filed Friday 30 October
Diesel: 201.9p a litre, 3.2p over the national average, filed Friday 30 October
Super unleaded: 199.9p a litre, filed Friday 30 October
Unleaded within 5 miles
Cullompton Fuel Express Automat: 169.7p a litre, 0.7 miles away. 3.2p a litre cheaper: saves £1.76 a tank, and costs about 27p of fuel to get there and back. Worth the trip.
Cullompton Superstore - Petrol Filling Station: 169.9p a litre, 0.3 miles away. 3.0p a litre cheaper: saves £1.65 a tank, and costs about 11p of fuel to get there and back. Worth the trip.
Mfg Willand: 171.9p a litre, 1.4 miles away. 1.0p a litre cheaper: saves 55p a tank, and costs about 54p 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.