Petrol and diesel prices at Invergordon Service Station

Invergordon Service Station, IV18 0AE.

What it is charging

• Unleaded: 173.9p a litre, 2.2p over the national average, filed Thursday 29 October
• Diesel: 204.9p a litre, 6.2p over the national average, filed Tuesday 27 October

Unleaded within 5 miles

• Mfg Morrisons Alness: 172.9p a litre, 3.0 miles away. 1.0p a litre cheaper: saves 55p a tank, and costs about £1.17 of fuel to get there and back. Not 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.