The Automobile Association says the latest fuel price rise is unjustified.
The cost of a litre of 91 octane rose on Friday to 215.9 cents and 95 octane increased to 223.9 cents. Diesel also went up four cents to 149.9 cents a litre.
The Automobile Association's petrol watch spokesperson, Mark Stockdale, says the rise does not reflect the increase in the commodity price of crude oil and the fall in the exchange rate.
He says those changes should have resulted in a two cent price rise, not four cents.
Mr Stockdale says fuel companies could have held off raising prices until next week to see if movements in the price and exchange rate are sustained.