RAC analysis found the average cost of a litre of the fuel at UK forecourts rose by 16.6p in June, from 174.8p to 191.4p - the highest monthly increase in records dating back to 2000.
But five consecutive weeks of falling wholesale costs have not been reflected at the pumps.
The organisation's fuel spokesman Simon Williams said:"The rate at which pump prices have been rising over the last four weeks is hard to comprehend. "There's no doubt that drivers are getting an incredibly raw deal at the pumps at a time when the cost-of-living crisis is being felt ever more acutely."
Mr Williams went on:"The silence from the Treasury when it comes to supporting drivers through this time of record high pump prices is, frankly, deafening.
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