With the cost of aviation fuel at $1.80 per litre, that equated to $342p/h and $576p/h respectively.
Most of the trust's helicopters were twin engine machines.
When the cost of aviation fuel rose 10 cents it cost $32p/h more to keep them airborne.
Motorists are buckling as petrol soars to its highest price ever, with most city outlets selling 91-octane fuel for 222.9c a litre.
National fire service chief financial officer Brett Warwick said cost increases in a tight budgetary environment had to be managed carefully. "Fuel is critical to New Zealand Fire Service operations but makes up less than 1 per cent of its total operating budget.
"The increase in fuel costs will be managed within the overall budget, without affecting operations."
The rising cost has made most petrol 1c a litre more expensive than the previous high watermark in May last year.
However, industry minnow Gull Petroleum is offering prices 8c-13c below those of the big four: BP, Mobil, Chevron and Z.
It has left economists, including UBS New Zealand's Robin Clements fretting about the effect on household spending through the fragile financial recovery.
"Petrol is such a pervasive product - it is like a tax - it will crowd out other spending," he said.
Oil companies are blaming the increase on greater economic confidence overseas - in the United States and Europe - as well as perennial tensions in the Middle East.
Automobile Association spokesman Mark Stockdale said after a succession of cuts in May and June, petrol had risen by 26c a litre in the past six weeks because of rising international commodity prices, fuel tax and oil company profit margins.