Petrol and diesel prices at South Islay Trading Co Ltd

South Islay Trading Co Ltd, PA427DF.

What it is charging

• Unleaded: 187.0p a litre, 15.3p over the national average, filed Tuesday 27 October

Unleaded within 5 miles

• South Islay Trading Co Ltd: 187.0p a litre, next door away

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.