After topping up, you should have offered to pay 10% less $$ for the 20 litres (the original bill) and see whether he thought that was fair
As VS 5.0 said, report him to the group that handles weights and measures. In Vic that responsability has probably been moved to the group that handles casinos and brothels (that's sarcasm in case it's not clear)
The more i think about it, the more annoying it is as this prick is stealing 2.3ltr for every 20ltrs the pump says it is dispensing... That equates to the buyer paying for 8 ltr more (according to the pump) just to fill up their VE/VF's 71 ltr tank. That's around $12 stolen per commodore, more or less for other makes. That is a theft that is occuring 24hrs/day, every day of the week at that petrol station
Report them
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Small businesses that buy or sell goods by weight, volume or length must also comply with the National Measurement Act 1960 and the National Trade Measurement Regulations 2009.
Businesses that short-measure their customers can be fined up to $170,000 per offence.
Such a fine would hurty and may wiope the smile of such pricks when they loose their job and are tossed on their arse for gaming the system.
From the above link, the place to ring may be... (if not they can redirect you)...
Trade measurement helpline
To find out more about trade measurement laws or report a suspected breach:
And then report him to CAV/ACCC as he's probably not changing his filters which may be the cause of your tank sludge