The Cost of (My) Gas Frugality

So yesterday I was proud of myself for finally going to the no-name gas station across town because it's cheaper than the (still moderately priced) local Shell that I normally use. That is, until I realized that the cheap station charged me for 14.8 gallons of gas... for filling up my 14.5 gallon tank! At today's gas prices, getting charged for even an extra half a gallon makes up for the price difference, but even if it didn't, I'd rather not feel cheated every time I go to the pump. I guess I'm sticking to Shell from now on...