You have probably come across the fact that 25-35 kopecks “cure” at a gas station, which gas station representatives explain by setting the electronics, or by an amount of fuel left in the fuel nozzle of a previous customer. Actually, this shouldn’t happen. Therefore, you must demand that the staff fully deliver the service you paid for.
However, you can prevent this by not indicating the amount for which you want to refuel your car at checkout, but the exact number of liters. Moreover, with a fully filled tank you can calculate the almost exact water displacement that went into it after the gas station. The technical data sheet of the vehicle and simple mathematical calculations will help.
Experienced drivers also check the “cleanliness” of gas stations by filling the bus. Here everything is much simpler: I poured gasoline into the container and saw with my own eyes how the paid liters corresponded to the volume of the container. As proof that they are right, the employees of the complex must provide the customer with a sealed control meter that complies with GOST.
If you are denied this and the fact of deception is obvious, feel free to contact the prosecutor’s office, file a complaint with Rospotrebnadzor and at the same time with the Committee for the Protection of Consumer Rights. Unless, of course, the government takes measures to resolve the conflict.