At 164.0p, the cheapest petrol in Isle of Arran is
2.7p above the UK average of 161.3p —
about £1.50 more
for a 55-litre tank. Within Isle of Arran itself the spread is 8.0p a litre, so
choosing the cheapest of the 4 rather than the most expensive saves about
£4.40 a tank.