Petrol and diesel prices at Valley Service Station

Valley Service Station, BT75 0QG.

What it is charging

• Unleaded: 167.9p a litre, 3.8p under the national average, filed Friday 23 October

Unleaded within 5 miles

• Beatty Retail Ltd: 163.9p a litre, 0.4 miles away. 4.0p a litre cheaper: saves £2.20 a tank, and costs about 14p 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.