Lively discounting on 91-octane petrol in Auckland is prompting the Automobile Association to renew a call for oil companies to be required to advertise prices of higher fuel grades as well.
Spokesman Mark Stockdale said the level of discounting found in an extensive two-day Herald survey of 162 stations from the Hibiscus Coast to Pukekohe was great for the 80 per cent of drivers who filled up on 91.
"It's good to see there is competition, particularly in the Auckland region, where a third of the population lives," he said.
"For a long time motorists used to complain there was no competition because everybody was charging the same price, but now those motorists' prayers are being answered."
But Mr Stockdale said there was less competition for customers of higher fuel grades because very few oil companies included their prices on boards advertising 91-octane petrol and diesel, and many drivers were paying too much as a result.