Prime Minister John Key and the Automobile Association have urged Kiwi drivers to switch to fuel-efficient cars to help combat high petrol prices.
AA spokesman Mark Stockdale said motorists could save precious dollars on their fuel bill by driving more fuel-efficient cars.
He warned high petrol prices, spurred on by increases in tax and rising international oil costs, were here to stay - therefore drivers needed to smarten up.
"A small car with an engine of up to 1.5 litres consumes half as much fuel as a large car over 3.5 litres."
The most recent 4 per cent increase in petrol tax has seen motorists paying about 90 cents a litre in fuel excise and GST.
The Government signalled last week further hikes in petrol taxes to finance big roading projects - meaning even more pain at the pump for motorists.
However, Mr Stockdale said: "Historically, Kiwis have tended to buy the car that they need for going away on holiday.
"That's your large station wagon or SUV with a big engine that's really good on the open road when you're carrying lots of passengers and you've got a boot full of gear.
"But, then they use the same car to commute to and from work."
He said Kiwi drivers tended to change cars every four years or so.
Despite the high petrol prices, New Zealanders were relatively well-off compared with other developed countries, Mr Stockdale said.
AA figures showed New Zealand petrol was the sixth cheapest in the OECD.
New Zealand Federation of Family Budgeting Services president Margaret Elsworth agreed fuel-efficient cars would help save families money on fuel bills but said vehicle upgrades were a low priority for those families already struggling to make ends meet.