"The result is a mixed picture. For petrol, the rand's weakness was mostly a counterpart of oil's retreat, pointing to a 7c-a-litre reduction at month end," the AA said.
"Diesel fared worse, with a slight increase of 12c a litre on the cards, and illuminating paraffin showing a 9c rise."
However, the AA reminds drivers the forthcoming carbon tax is due for introduction on June 5, and will add an additional 9c a litre to the petrol price, and 10c to the diesel price.
"Our hope is that the new government will immediately set out its policy agenda which has a direct impact on fuel prices," the AA concluded.