Australian consumers are being ripped off up to $12 million a year from faulty petrol pumps.

The National Measurement Institute has released its latest report into bowser calibration, finding five per cent are shortchanging motorists.

“Even though that’s small for the individual consumer if you add that up to the total sales across Australia that can add up to between $4 and $12 million in consumer detriment,” Bill Loizides from the Institute said.

Northern Beaches resident Richard Johnson noticed a discrepancy at his local petrol station after filling up his car.

The receipt showed he had put more petrol in the tank than was physically possible.

“Given that it had eight litres in it, and it only holds 150. That’s an overfill or an over supply of fuel of 15 litres,” Mr Johnson explained.

He conducted his own testing, taking a jerry can to the service station, where he filled up 10 litres of fuel but was charged for more than 12.

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