Story goes like this. Fill up the car, $49.20 worth of petch (43 litres or something) then i go to pay at a Mobil on Maroondah hwy. Get in and put my $50 down on the bench. The clerk has a 50 already in his hand. I ask him "If I spend $2 in-store dont i get 4c off a litre?" he goes "No, its $5". So I grab 2 of the nearest packs of lollies, starburst gummi's (Of course) and he goes "Yep, $55.80 mate" I hand him $10 more and he puts it with the $50 he already has in his hand and goes "Here's your change" I picked my $50 off the counter thinking I gave him 2 $50's as i had more than 1 in my wallet and asked "Is that my $50 in your hand?" He goes "Yep"... My conscience told me I should ask again to which he replied "Yeah I'm sure" I walked out $4.20 poorer and 43 litres and 2 packs of starburst gummi's richer.