Claims of profiteering as average fuel prices rise by 10p since start of the yearPetrol and diesel prices have risen by 10p since the start of the year, adding £5.50 to the cost of filling up the average family car.
The RAC said a typical price for a litre of petrol increased by 3p to 150p in April alone.
Drivers are being “seriously overcharged for diesel”, with average prices rising by 2p per litre to 157.8p in April, it said.
In April, before the most recent increases, the average cost of filling a family car was £82.50 according to figures from the AA.
Fuel prices have risen as a result of Iranian-backed missile attacks on shipping in the Red Sea, forcing oil tankers to take a longer and more costly route to Europe.
RAC spokesman Simon Williams said: “Drivers are once again having to dig deep just to go about their daily lives.
“Our data shows petrol and diesel have now gone up 10p a litre so far this year on the back of further increases in April of 3p and 2p respectively.
“Some of this is down to the oil price and the pound-to-dollar exchange rate making wholesale petrol more expensive for retailers to buy.”
The RAC is, however, calling on the Competition and Markets Authority (CMA), a Government watchdog, to address “glaring issues” with fuel retailing.
The motoring organisation claims retailers are overcharging motorists by making too much profit on the price of a litre.
Mr Williams said: “Worryingly, the CMA’s warning shot about higher retailer margins at the end of March appears to have fallen on deaf ears, meaning drivers are once again being seriously overcharged for diesel.”
The RAC said if the biggest fuel retailers charged “fairer margins” it would stop so-called rocket and feather pricing, where pump prices surge when wholesale costs rise but fall slowly when those costs decline.