The cost of petrol in the UK has had its biggest fall since 2008.
The average cost now is 131.16p per litre. This represents a drop of 5.49 between mid-September and mid-October.
In November 2008, prices dipped by 11.5p.
The price of diesel has fallen from 142.50p a litre to 139.12p.
The AA said lower wholesale fuel prices had prompted the price drop, but warned that further falls were unlikely.
The organisation says the price drop means a savings of £2.74 to fill up a smaller car and £3.84 for a larger one.
Northern Ireland is the most expensive place for petrol, with an average pump price of £132.9p a litre, and London, the north of England, and Yorkshire and Humberside are the joint cheapest at 131.9p.
Scotland is still the most expensive for diesel at 140.1p a litre, while London is the cheapest at 138.6p.
The AA said further falls in petrol prices were unlikely, because of poor refinery capacity in the UK and the likely strengthening of the US dollar.
