Petrol and diesel prices at Asda Borough Express Petrol

Asda Borough Express Petrol, HP21 9LB.

What it is charging

Unleaded: 171.9p a litre, 0.2p over the national average, filed Tuesday 27 October
Diesel: 199.9p a litre, 1.2p over the national average, filed Tuesday 27 October
Super unleaded: 190.9p a litre, filed Tuesday 27 October

Ascona Adam's Corner Service Station: 169.9p a litre, 0.7 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about 27p of fuel to get there and back. Worth the trip.
Mfg Aylesbury: 169.9p a litre, 0.8 miles away. 2.0p a litre cheaper: saves £1.10 a tank, and costs about 30p of fuel to get there and back. Worth the trip.
Shell Co-op Aston Clinton: 171.9p a litre, 3.0 miles away
EG Wendover Pfs: 171.9p a litre, 3.8 miles away
Mega Petroleum Limited: 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.