Shell Gas Station
Pump accurate?

I fill up my tank and realized big drop on my cars mileage from 15.7 liter per 100 km (read from car computer) to 18.4 liter per 100 km, it is only highway and city combined driving as usual, how do we know the pump did pump out the right amount of gas?

Company: Shell Gas Station
Country: Canada
Province: Ontario
City: Brampton

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