As well as hitting a new record-high price of 167.3p on Tuesday 22 March, the average cost of a litre of unleaded petrol went up by a huge 11.62p to end the month at 163.28p per litre – the largest ever increase the RAC has recorded in a single month. The previous biggest monthly increase was in October of last year when petrol prices rose by 7.43p a litre.