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When this scam is implemented by someone intentionally by chipping the pump (mentioned by another poster), the calculator method of catching it doesn't work very well unless you know the precise volume of space available in your gasoline tank at the time of your purchase, to withing 1/100th of a gallon, and knowing that is basically impossible for an average person just pulling in to fill up. That is, you have to know the volume you pumped independently of what the pump is telling you. If done properly, the manipulated pump reports the volume pumped incorrectly, not just the price, e.g. the pump says you got 10.1 gallons, but you actually got 10.0, and you're charged for 10.1.
What you can do yourself is use a 5 gallon gasoline container (need to pump more than a gallon to get an accurate reading) and fill it precisely to the 5 gallon line and then do the calculation. This is basically what the inspectors do when they check a station's pumps.
This kind of thing is really hard to spot for the average consumer who doesn't intentionally try something like the above. What *does* happen a lot is that people figure the price they should be paying based on the gallons pumped, and they forget to include the fraction of a cent that is present with most ppg in most states. The marquee reads 2.59/gal, but in most places it is actually 2.599. So, what happens is someone pumps ten gallons exactly, sees they were charged 25.99 for the purchase rather than 25.90, and if they don't remember the fraction, they get POed and report a problem where there isn't one. Obviously, the larger the volume you pump, the greater the variance people will accidentally calculate. And this causes a problem for the state regulatory agencies because they end up sent on wild goose chases.
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