Petrol and diesel prices at Asda ST Helens Superstore

Asda ST Helens Superstore, WA10 2EF.

What it is charging

Unleaded: 167.7p a litre, 4.0p under the national average, filed Thursday 29 October
Diesel: 193.7p a litre, 5.0p under the national average, filed Thursday 29 October

West End road Service Station: 161.9p a litre, 2.0 miles away. 5.8p a litre cheaper: saves £3.19 a tank, and costs about 73p of fuel to get there and back. Worth the trip.
Costco Wholesale Haydock: 162.9p a litre, 3.6 miles away. 4.8p a litre cheaper: saves £2.64 a tank, and costs about £1.33 of fuel to get there and back. Worth the trip.
Asda Haydock East Lancashire Road Petrol Filling Station: 165.7p a litre, 3.5 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about £1.31 of fuel to get there and back. Not worth the trip.
Haydock Church RD Superstore - Petrol Filling Station: 166.9p a litre, 3.3 miles away. 0.8p a litre cheaper: saves 44p a tank, and costs about £1.25 of fuel to get there and back. Not worth the trip.
Euro stars widnes ltd: 166.9p a litre, 4.7 miles away. 0.8p a litre cheaper: saves 44p a tank, and costs about £1.78 of fuel to get there and back. Not worth the trip.
Mfg Morrisons ST Helens Boundary Road: 167.9p a litre, 0.4 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.