Filling a car up was cheaper in November than it has been for over half a decade and prices will continue to fall in the run-up to Christmas, according to the RAC.

With fuel duty expected to rise from April 2016, Brits have been taking advantage of the lowest prices they've experienced for years, with diesel dropping as low as 109,48p a litre on 30 November — the lowest it's been since 28 December 2009.

Petrol prices have also tumbled for the fifth consecutive month; the average price at forecourts was 106.98p, with ASDA's 99.7p a litre over Black Friday weekend driving fuel costs down.

Pumping savings: Petrol drivers saved £7.75 every time they topped their car up in November compared to last year

The RAC's Fuel Watch data said the cost of filling up an average petrol family car with a 55-litre tank plunged by £7.75 compared to November last year, while diesel owners were £8.95 better off each time they topped up.

This was down to a combination of consistently low crude oil prices and Black Friday supermarket deals rewarding drivers at the pump.

Oil prices sank to $40.40 during the month – the lowest barrel price since February 2009 - while ASDA dropped petrol to 99.7p a litre at its 277 fuel stations over the final weekend of November. Morrisons also rewarded customers who spent £40 in store with a 7p discount on fuel, resulting in sub-£1 a litre petrol during the Black Friday week.

The RAC Fuel Watch report said a barrel of crude oil fell over $3 in November, coming down from $47.32 to $44.03, with the six-year low of $40.40 being seen on 16 November.

Unfortunately, due to the pound losing ground to the dollar – with a pound worth $1.54 at the start of the month and $1.51 at the end – some of the positive effect of the lower oil price was lost.

And the low cost of filling up won't end in November, the RAC suggests.

The motoring group is predicting that petrol price will continue to fall for the next two weeks and has suggested diesel will be 2p a litre cheaper by mid December.

ASDA was the first to provide sub-£1 a litre petrol prices without having an in-store promotion attached to the deal

The table provided by the RAC showcases how fuel prices have declined in 2015, with petrol in a downward trend since July

RAC Fuel Watch spokesman Simon Williams said: 'In the expensive run-up to Christmas, drivers of both petrol and diesel vehicles are benefitting from far cheaper fill-ups than they did at this time last year.

'While petrol for under a pound a litre has become a reality at the cheapest retailers we would like to see this happen on a non-promotional basis. This depends, of course, on the cost of a barrel of oil staying low and ideally trading down a little closer to $40 for longer – something which is very hard to predict, particularly as OPEC meet tomorrow (4 December) in Vienna to discuss oil production strategy.

'There has been talk of stabilising the barrel price which would mean stemming production, but it's difficult to see how that would work when Iran begins to pump up to one million barrels a day in 2016, following on from its landmark nuclear agreement with the West.'

Concerns that prices could rise if the Chancellor announced an increase in fuel duty in last week's Autumn Statement were initially quashed when George Osborne failed to mention it during his speech on Wednesday.

However, the small print of the Spending Review documents shows the Treasury’s takings from fuel duty are expected to rise more than 2p a litre in April 2016 – and steeper rises every year after that at the rate of inflation every year until 2020.

But that isn't stopping drivers from filling up their cars today.