The motoring group says motorists and businesses are paying well over the odds for diesel and the government must take action to ensure transparency in the market UK-wide.
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The Chancellor is being urged to freeze fuel duty and VED, and tackle issues around electric vehicle charging infrastructure ahead of the Budget tomorrow.
RAC analysis found that average pump prices on forecourts should be 11p a litre cheaper for petrol and 14p for diesel if retailers were playing fair with drivers.
Environment Minister Mark Spencer said punters facing soaring costs should use market forces to force retailers to lower prices, as it was revealed filling up with diesel now typically costs £97.
Motoring experts last night accused retailers of 'heartless overcharging' by failing to pass on big falls in wholesale prices. Diesel has reached 176p a litre at the pump.
With the wholesale price of both fuel falling, petrol and diesel should have been 14p and 15p-a-litre lower than what they currently cost, says the motoring group.