Z Energy's Chief Executive is raising concerns over government monitoring of fuel profits.  

The Ministry of Business and Innovation releases weekly data that shows the margin retained on a litre of petrol. 

It shows on regular 91, the margin made by fuel importers has risen from 33 cents to 52.4 cents a litre in the past three weeks.  

But Lindis Jones told Mike Hosking that it's not reflective of the margins they're seeing. 

He contends that in a ballpark figure, the margins are roughly half those quoted in the data. 

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