How Much Does a Gallon Of Gasoline Weigh? (Explained)

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To avoid running out of gas, some drivers save up gas in gallons and have them stored in the trunk, mostly. If this is the case with you, then you would love to know much weight a gallon of gasoline would add to your car.

Notwithstanding, there could be many other reasons why some people may want to know the weight of gasoline. Gasoline from different gas stations may weigh differently due to the presence of several additives that may be added to the gas in different fuel stations. So, how much does a gallon of gasoline weigh?

In the US, a gallon of gasoline weighs approximately 6 pounds (6 LBS). This is below the approximated weight of a full gallon of water. However, the weight may slightly vary depending on the type of gasoline (regular, premium, E85) and the gas station where you bought it.

This article clarifies everything you may want to know about the weight of gasoline when stored in different container/gallon sizes.

How Much Does a Gallon Of Gasoline Weigh?

The truth is, there is no one-size-fits-all weight for gasoline stored in a gallon. Firstly, the refining process of gasoline may differ in different refineries, and also, at the gas stations, refined gas is further treated with certain additives and “components” to achieve specific results.

However, the average standard weight of a gallon of gasoline in the US is six pounds (6 LBS). Now, depending on the type of gas and the fuel station where you bought it, the weight of a gallon of gasoline might go up to 6.5 LBS.

Some gallons are heavier and can equally affect the weight you’d be adding to your car when you try to save up gasoline for long trips. If you decide to store up to 3 gallons of gasoline, you’d be adding approximately 19.5-pound weight to your car; does that seem too much?

With this knowledge, you can tall how much weight is added to your car when you drive on a full tank. For cars with 16-gallon gas tank capacity, on a full tank, your car just accumulated 104LBS weight. Well, this weight does not actually affect your driving.

Which Is Heavier, Gasoline Or Water?

When you mistakenly mix gasoline with water, you’d notice that the gasoline would float on top of the water. This is a clear sign that water has more density than gasoline, which also implies that water is heavier than gas.

A US one gallon of water weighs approximately eight pounds (8 LBS). Gasoline would always be lighter than water regardless of all additives that may be added to the gas. Now, you know how much weight you’re adding to your car by storing a gallon of water or gasoline in your car trunk.

How Much Does 20 Gallons Of Gas Weigh

From the approximated value given for one gallon of gasoline, the weight of 20 gallons of gas would be 130 pounds (LBS), which is 6.5LBS (per gallon) multiplied by twenty gallons.

However, this is for information purposes only, several factors may affect the weight of gasoline.

Related Questions

How Much Does 10 Gallons Of Gas Weigh?

10 US gallons of gas would weigh between 60lbs to 70lbs on average. It may weigh more depending on the additives added into the gas, and the type of gallon used. Gasoline is light anyways, lighter than water and diesel.

Which is Heavier, Diesel or Gasoline

If you mix gas and diesel, the gas will come atop while the diesel would remain under because of its density. Diesel weighs more than gasoline; a gallon of diesel weighs 7lbs while a gallon of gas weighs 6.5lbs.

How Much Does 87 Octane Gasoline Weigh?

Whether it is 87 gas, regular gas, or premium gas, the average weight of gas per US gallon is 6.5 pounds. So, a gallon of 87 gasoline weighs the same as a gallon of regular gas, and the weight is 6.5lbs.


So, how much does a gallon of gasoline weigh? It weighs 6.5 pounds when you measure it with US gallons, and this is for information purposes only.

Also, the weight is liable to slightly vary based on multiple factors, which include the type of gasoline and where it was bought.

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