Any day now the government is due to make a decision on whether to extend or curtail the fuel discount that is part of its cost of living relief package.

In March it cut petrol tax by 25 cents a litre and road user charges by the same.

Public transport fares were slashed in half.

The discount was supposed to last three months, but was extended into next January as inflation remains stubbornly high,

The finance minister says he will decide by Christmas what to do next.

AA's fuel spokesperson Terry Collins says a lot will depend on what is happening worldwide, while the government would be concerned adding the fuel tax back on would add to inflationary pressures.

When the government acted last March the price of petrol had reached around $3.15 a litre.

Over winter, a weaker New Zealand dollar was apparent at the same time as fuel prices "started to go through the roof".

Prices have since stabilised at around $2.30 to $2.50 for 91 which is "a pretty good level", says Collins.

If the tax went back on motorists could expect to pay around $2.60 a litre at the pump.

Collins says the tax should be added incrementally, 5-10 cents at a time monthly, so motorists did not spill out onto the roads and cause petrol stations to run dry as they tried to fill up.

"Instead of thinking about a timeframe focus, think about a price frame focus."

This could be done with the fuel excise duty but not the road user charges.

If the government took the gradual approach it would stop massive queues at the pump.

"We don't think it's a good idea if it comes on in one hit."

As the government weighed its options, Collins says AA is worried about the shortfall in road maintenance funding.

"Mind you, we need the money because we spend it on maintaining and improving our roads and without the money going towards the fund we have to find other ways of funding it [the work on the roads]."

The AA takes the view the money that is being lost for road maintenance has coincided with one of the country's worst winters, he says.

Its members are concerned about potholes and the workmanship of the repairs.

"They just don't think the repairs have been good enough. Also, we're lagging behind on those safety improvements like median strips that will stop those head-on collisions.

"We're really keen on getting that maintenance done, repairs done, and those improvements that will make our roads safer."

-RNZ.