johno1234:
Not funny if you think i through.
Most diesel owners top up RUC in large amounts infrequently so the $12 is neither here nor there. I usually get either 5000 or 10000km at $76/1000km so I don't care about $12 against a $380 or $760 fee. The issue is people with no money who will top up their tank with $20. If they top up their RUC at the same time say 200km that the tank is good for they pay $15 for the actual RUC mileage and $12 for the admin fee. Massive punishment for purchasing in small lots. No way around it with the windscreen labels.
Sounds like people will very quickly learn to budget