The letter reveals “tricks,” mostly based on physics, on how to get more gas for the price you pay, and we have translated it into English, just in case you don’t know. So here they are:
1. It’s best to fill your gas tank in the morning, while it’s still cold. Most of the gas is buried underground and is getting colder during the night. It’s known that gas gets hotter as the day heats up, so when you fill your tank in the afternoon, “a gallon” is actually less than a gallon.
2. When you’re filling up, do not squeeze the trigger of the nozzle to the high setting. The trigger also has a “low” setting, which means fewer vapors are created during filling. When you pump on the high setting, more vapors are created and are being sucked back into the underground tank and you get less gas for your money
3. Fill up when your gas tank is half-empty. The reason is because when you have more gas in the tank, the less air there is that can fill the tank.
4. If you come to fill up on gas and you see a truck that feeds the station underground – don’t fill up. It’s possible that the truck creates a whirlpool that can bring dirt and sludge into your tank.