Petrol and diesel prices at Harbour Filling Station

Harbour Filling Station, IV31 6PB.

What it is charging

• Unleaded: 175.9p a litre, 4.2p over the national average, filed Thursday 29 October

Unleaded within 5 miles

• Bishopmill Service Station: 167.6p a litre, 4.3 miles away. 8.3p a litre cheaper: saves £4.56 a tank, and costs about £1.63 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.