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UK diesel price: Average cost of filling a car hits £105

car  FILE - In this June 30, 2016 file photo, nozzles pump gas into vehicles at a BP gas station in Hoboken, N.J. A week after New Jersey's gas tax goes up by 23 cents a gallon thanks to a new law, voters will weigh in on whether every cent of the tax should to exclusively to transportation (AP Photo/Julio Cortez)
Petrol increases by 4p a litre to 166p taking a full fill-up to £91 for a 55-litre car. Photo: Julio Cortez/AP

The average price of diesel shot up by more than 10p a litre in October, the third biggest monthly increase on record, meaning that now costs £105 ($121) to fill up a 55-litre diesel car.

A litre of diesel went from 180.37p to 190.51p making October’s rise second only to the ones seen earlier this year in March (22p) and June (16p).

The price of petrol also increased, by around 4p a litre from 162.67p to 166.38p which means a full tank costs £2 more at £91.51.

October also saw the gap between the forecourt prices of diesel and unleaded reach an all-time high of 24p a litre.

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RAC fuel spokesman Simon Williams said: “After three months of falling pump prices October was a severe shock to the system for drivers with the unwelcome return of some scary numbers on forecourt totems. Those with diesel vehicles suffered most with 10p being added to the cost of a litre in what was the third worst monthly increase on record, but petrol car drivers also saw a 4p-a-litre increase across the country.”

October also saw the gap between the forecourt prices of diesel and unleaded reach an all-time high of 24p a litre.

The average price of unleaded at one of the big four supermarkets went up 4p from 161.31p to 165.36p; diesel jumped 9p from 178.51p to 187.54p. Motorway petrol increased nearly 8p from 182.83p to 190.48p while diesel rocketed by 12p from 192.74p to 204.24p.

Williams added: “The fear now, particularly for diesel drivers, is whether the average price of a litre is heading back to that record of 199.09p which made a full tank cost more than £109. Looking at the wholesale market we strongly hope the price should stabilise. And those with petrol cars should actually see forecourt prices start to go slightly the other way as the wholesale cost of unleaded appears to have peaked – at least for the time being – in mid-October.

“We strongly urge drivers to make sure they always know where they can buy fuel at the lowest prices. Those who assume their local supermarket will be the cheapest may be in for a nasty surprise as the ‘big four’ are currently only a penny cheaper for petrol than the UK average. Diesel, however, is 3p a litre less than the average when bought at a supermarket.

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The cheapest place to fill up is Costco where a litre of petrol costs an average of 154p and diesel 176p – 12p and 14p lower than the UK averages.

Williams said: “It’s interesting to see just how low fuel can be sold even at a time of $90 oil and a weak pound. Clearly, Costco’s margins are low, but they must surely still be making a profit.”

Price hikes began at the start of the month when oil producer group OPEC+ agreed to cut production by 2m barrels a day. This led to the barrel price going up 7% from $88.86 to $94.83, hitting a high of $97 on 27 October.

This combined with the weaker pound made wholesale petrol and diesel – which is traded in dollars – more expensive.

Watch: ‘That’s insane!’ Motorists react to BP’s £7.1bn profit