Z Energy's expanding its 'top up shops' in hopes of helping with competition in the grocery sector. 

The gas station chain is expanding its grocery offering as part of a diversification push. 

It will target customers looking for convenience between their large shops – for snacks or staples. 

Grocery Action Group Chair Sue Chetwin told Mike Hosking they'll have nothing fresh or frozen, which is where the competition is. 

She says they'll have bits and bobs, but it's not the answer to very high grocery prices. 

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