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When economic conditions are tough and/or the price of gasoline rises substantially, the suggestion that already financially pinched consumers aren't even getting a fair shake at the pump is enough to make anyone see red. So, it's not surprising that the warning quoted below and its variations about cheating at gas pumps quickly gained widespread currency in April 2008 as gasoline prices edged towards $4.00 per gallon, and began hitting inboxes again during an ongoing economic downturn in May 2009: Examples: Variations: It's difficult to verify whether some anonymous person in Georgia truly encountered a malfunctioning gas pump one day in April 2008 (and whether his report of same was accurate), but the Georgia Department of Agriculture told us at that time that the pumps at the station referenced in the quoted e-mail had been checked by that agency's Fuel and Measures Section in November 2007 and were re-checked (in response to this e-mail) in May 2008, and in both cases they were found to be operating according to standards: Since this message conflates two distinctly different issues (whether gas pumps accurately report the amount of gasoline dispensed vs. whether gas pumps accurately register the proper charge for the amount of gasoline dispensed), we'll address them by discussing some general factors involved in the dispensing of gasoline. Vendors of gasoline are subject to a variety of state and federal laws requiring them to maintain adequately calibrated dispensing equipment and calling for periodic inspections by government regulatory agencies to ensure that they are in compliance with said laws. However, this does not guarantee that every gas pump you might encounter will necessarily be accurate, for a variety of reasons: Some agencies may not have the funds to regularly carry out required inspections at every location, regulators' equipment might itself be inaccurate, understaffed agencies may not be able to adequately enforce compliance with regulations, etc. Furthermore, instances of malfunctioning or improperly calibrated pumps are not necessarily indicators that a particular gasoline vendor is cheating. Such irregularities may be due to worn-out equipment which can be difficult to spot (and is about as likely to cheat the vendor as it is the customer), such as the common occurrence of worn check valves: Unfortunately, much of the responsibility for spotting such irregularities and reporting them to regulatory agencies falls upon consumers themselves, and it isn't always easy for the average consumer to notice problems like the ones described in the above-quoted message. Determining whether a particular pump is correctly reporting the amount of gasoline dispensed can be rather difficult, especially if the difference is relatively small — just about all consumers can do in this area is to be aware of how much gasoline their vehicles should take at various fuel gauge level readings and note whether the reported number of gallons they buy corresponds to this number. (That is, if you know your car typically takes seven gallons to fill when your gas gauge needle is on the halfway mark, you should be concerned if a half-tank fill-up suddenly takes eight or nine gallons instead. Note that you need to learn this system by trial and error: Because gas gauge needles do not necessarily move at an even rate across the full range between F and E, you can't assume that a car with a 14-gallon gas tank will necessarily take exactly seven gallons to fill when the needle sits on the halfway mark.) It's much easier to determine whether pumps are accurately registering the proper charge for the amount of gasoline dispensed simply by multiplying the number of gallons you buy by the price per gallon. (If you can't easily do this calculation in your head, you can either use a calculator or employ the suggested method of noting the total dollar charge at the moment the pump reads exactly ten gallons dispensed.) But of course, catching this sort of problem is only possible if the pump is accurately reporting the amount of gasoline dispensed, which, as noted above, is usually much more difficult to determine. (It can also be the case that gas pumps which test as correctly calibrated when dispensing, say, five gallons of gasoline may not necessarily test as correctly calibrated when dispensing smaller or larger amounts of fuel.) For now, though, it's generally the case that the retail gasoline industry has a number of other (and bigger) problems to deal with, and that consumers have not (so far) been very aggressive in reporting the problems they might encounter:
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