Petrol and diesel prices at Asda Westbrook Superstore

Asda Westbrook Superstore, WA5 8UG.

What it is charging

Unleaded: 168.9p a litre, 2.8p under the national average, filed Thursday 29 October
Diesel: 192.9p a litre, 5.8p under the national average, filed Sunday 18 October

West End road Service Station: 161.9p a litre, 4.9 miles away. 7.0p a litre cheaper: saves £3.85 a tank, and costs about £1.80 of fuel to get there and back. Worth the trip.
Costco Wholesale Haydock: 162.9p a litre, 4.8 miles away. 6.0p a litre cheaper: saves £3.30 a tank, and costs about £1.77 of fuel to get there and back. Worth the trip.
Asda Haydock East Lancashire Road Petrol Filling Station: 165.7p a litre, 4.7 miles away. 3.2p a litre cheaper: saves £1.76 a tank, and costs about £1.77 of fuel to get there and back. Not worth the trip.
Euro stars widnes ltd: 166.9p a litre, 2.3 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about 87p of fuel to get there and back. Worth the trip.
Asda Birchwood Superstore: 166.9p a litre, 4.0 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about £1.51 of fuel to get there and back. Not worth the trip.
Haydock Church RD Superstore - Petrol Filling Station: 166.9p a litre, 4.2 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about £1.59 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.