Z Energy says demand for petrol is falling substantially, due to fuel price spikes and lifestyle changes among Kiwis.

Brent crude oil prices are at a 10-month high, with 91 fuel reaching $3.20 a litre in some parts of the country.

Retail General Manager, Andy Baird says demand for jet fuel remains strong, while the consumer market is under pressure.

"And that's, we think, just a factor of the pre-Covid piece. Consumers can work from home and they're doing that, so that's 2 or 3 trips a week they're now not taking. And of course, the weather hasn't been great either, so those weekend trips are down as well."

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