Here in the US, there are basically three types of gas: regular (87), mid-grade(89) and premium(92).
The other day I stopped to fill up the tank and noticed that each of the three types of gas had a small counter above them. (First gas station in which I saw this, btw).
So I proceeded to ask the person who was filling the tank (yes, in some states it is illegal to pump your own gas - for some non obvious reason) what the small counters represent. As I have correctly guessed they were the number of gallons pumped. Something like 230000 for regular, 85000 for mid grade and 150000 for premium.

Very interesting you say? Indeed.
So I asked the “filler” when was the last time those counters were reset.
To my shock I found out that numbers were for a day.
Okay. Seemed a “little” high so I decided to do the math (I am a very bored person).
So for the sake of simplicity:
Let’s say that the pump only has one type of gas, every car that come is has an empty gas tank, the tank capacity is 20 gallons, and everybody completely fills up their tanks. Number is for 24 hours. (you see that numbers are stretched to extreme)
So, 200000 gallons / 20 gallons per tank = 10000 cars.
24 hours = 24 * 3600 = 86400 seconds.
That would mean that every 8.64 seconds a car should pull in, fill up the tank, pay and go (in less or equal to 8.64 seconds).
Ain’t gonna happen. (also keep in mind the 3 types of gas, the fact that you probably need a SUV to have that big of a tank, person who pump needs breaks, you need to continuously bring in gas trucks to replenish the stations supply, and the person who pumps the gas usually does it for all the pumps - not just one)
So, there you have it, the proof that persons who pump gas are liars. :) Mwuahahaha
And if my little gas story seems boring, here is another one that is even more boring.