Petrol and diesel prices at Brynamman One Stop

Brynamman One Stop, SA18 1TF.

What it is charging

Unleaded: 168.9p a litre, 2.8p under the national average, filed Friday 30 October
Diesel (B10): 196.9p a litre, filed Friday 30 October

Glanamman Service Station: 167.9p a litre, 2.0 miles away. 1.0p a litre cheaper: saves 55p a tank, and costs about 76p of fuel to get there and back. Not worth the trip.
Vst Pontamman Service Station: 167.9p a litre, 4.3 miles away. 1.0p a litre cheaper: saves 55p a tank, and costs about £1.64 of fuel to get there and back. Not worth the trip.
Asda Ystalyfera Supermarket: 171.9p a litre, 4.7 miles away
Ystradgynlais Superstore - Petrol Filling Station: 172.9p a litre, 4.9 miles 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.