But Z spokesman Jonathan Hill said his company would simply pass on the tax rise as a straight cost imposed by the Government.
He said there had been import cost and exchange rate movements "both ways - unfortunately none of which help motorists - and tax is just one of those things in life".
Caltex stations will lift petrol prices by 3c a litre, a spokesman said.
Automobile Association spokesman Mark Stockdale acknowledged the inevitability of petrol going up today, especially after commodity cost increases and a softening of the New Zealand dollar.
Diesel users face an equivalent increase in road-user charges, although those are not paid for at the pumps.
Today's excise duty rise pushes total tax on petrol to about 92.3c, or 42.7 per cent of the pump price. That includes 64.1c in excise and the rest in GST.
It follows a 2c excise rise in August last year and precedes more increases of 3c for each of the next two years, the proceeds of which all go into the National Land Transport Fund to pay for roads and public transport. Mr Stockdale said New Zealand still had the fifth-lowest fuel taxes of countries in the 34-member OECD.