Do you get more gasoline or petrol if you fill your gas tank early in the morning when the temperature of the gas stored in the underground tanks is lowest?

Answer 1

When a commercial or military plane is fueled, the quantity of fuel pumped into the aircraft is measured in pounds (or kilograms), not gallons or liters, because the weight of the fuel doesn't change depending upon the temperature, whereas its volume changes with temperature. In other words, six pounds of fuel is six pounds of fuel, whether it is arctic cold or desert hot. Volume, on the other hand, varies with temperature. For every five-degree (Celsius) increase in temperature, the volume increases about 0.5 percent. For pilots taking on hundreds of pounds of fuel at a time and for whom running out of fuel is a grave concern, that matters. But for motorists, it matters little. Theoretically, a gallon of gas pumped at 80 degrees Fahrenheit will weigh less -- and therefore contain less energy -- than a gallon of gas pumped at, say, 60 degrees F (which is a common temperature standard), but for all practical purposes, the difference is negligible. Presumably, motorists who are "shortchanged" on 80-degree days will make up their theoretical losses on the 40-degree days. Moreover, it is not possible to say with certainty that the temperature of the gas is actually cooler -- and therefore denser -- in the morning. Most modern underground tanks are double walled, which provides a degree of insulation, making the tanks act somewhat like a thermos. If the tank was recently filled with warm gasoline form a tanker truck, it may stay warm for days, regardless of the time of day and the temperature of ground. Wow, this must be an oil rep's answer above,..lol. Yes, you are shorted in warm weather, read what the answer says above about it being made up for on a colder day, this is a myth. Try reading this link below it may help you understand the business of selling oil products. http://www.turndownhotfuel.com/myths.html

Answer 2

It doesn't matter what time you fill up your gas tank as the temperature of the gas in the underground tanks won't significantly affect the amount you receive. The volume of gasoline or petrol you get is measured by the pump and is not influenced by the temperature. Any fluctuations in volume due to temperature are already factored into the pump's measurements.