A gallon of regular gasoline weighs about 6 pounds (2.72 kg) at room temperature, making it important for drivers planning a road trip, towing, or storing fuel. Whether you’re hauling a 5-gallon can of gas around or just figuring out the payload for your truck, the weight of your gas can prevent breaking down or losing performance. A trusted vehicle maintenance resource can make it easier to understand fuel weight dynamics and towing capacities.
- 1 gallon of regular gasoline weighs 6 lbs, while 93 octane is about 6.1-6.3 lbs.
- A 5-gallon can of gas would weigh about 30-31.5 pounds (fuel only), plus 2-5 pounds for the can.
- Diesel is 7 pounds per gallon, about 14-17% heavier than gasoline.
- Gasoline is about 25-30% lighter than water (8.34 pounds/gal), affecting buoyancy and vehicle load.
- Factors like temperature, ethanol blend, and additives slightly affect gas weight, with colder temps increasing density.
Let’s take a look at the specifics of the gasoline weight, diesel comparisons, and why this information matters for your trip.
What Is the Weight of a Gallon of Gas?
A gallon of regular unleaded gasoline weighs around 6 lb at 60 °F. Premium gas rated at 93 octane is slightly heavier, weighing 6.1 to 6.3 lb/gal, primarily due to additives like detergents.
Here’s a quick look at key fuel weights:
| Fuel Type/Can Size | Weight (lbs) | Weight (kg) | Practical Notes |
| Regular Gasoline (1 gal) | 6 | 2.72 | Standard for most cars; lighter than water. |
| 93 Octane Gasoline (1 gal) | 6.1-6.3 | 2.77-2.86 | Premium fuel with additives; slightly heavier. |
| Diesel (1 gal) | 7 | 3.18 | Heavier; impacts towing and efficiency. |
| 5-Gallon Gas Can | 32-36.5 | 14.5-16.6 | Includes can weight (2-5 lbs); store safely. |
However, the numbers may vary due to the following factors:
- Temperature: Lower temperature results in denser gas. Although it seems insignificant (approximately ~0.06 lb/ gal at 60 °F), it is well documented. For every 1°F increase in temperature, ~1 ppm is added to the volume, thereby expanding gasoline. Summer heat is a clear example of this volume expansion due to temperature.
- Ethanol Blends: E10 or E15 (10-15% ethanol) will lower the density value even more. For example, Engineering Toolbox has suggested that a gas blended with ethanol can weigh as little as 5.9 lb/gal.
- Additives: The detergents & cleaners in premium gas do contribute a small amount to the value at best.
Gasoline weights can range anywhere from 5.76 to about 6.35 lb/ gal. However, the most reliable number to estimate for quick math is 6 pounds. This information also gives you a reference when calculating fuel loads for your upcoming road trip.
Also Read: What Is The Normal Engine Oil Temperature?
How Much Does a 5-Gallon Can of Gas Weigh?
5 gallons of regular gas weigh 30-31.5 pounds, depending on the temperature & blend of the gas. When you add in the weight of the gas can (2-5 pounds according to the standards of NFPA), you are lifting 32-36.5 pounds in total.
Here’s a brief gasoline weight summary:
| Gas Can Size | Gas Weight |
| 1 gallon | ~ 6 lbs |
| 2 gallons | ~ 12 lbs |
| 5 gallons | ~ 30-31.5 lbs |
| 6 gallons | ~ 36-37.8 lbs |
To maintain safety, it is recommended to store gas cans in an area that is well-ventilated, while only transporting 5 gallons or less of gasoline with a properly marked NFPA can.
Knowing this weight helps determine how much you can comfortably load into your trunk without overloading the vehicle.
Try this gasoline weight calculator to determine the best estimate for your gasoline weight.
Gas vs. Diesel: Which Is Heavier?
Diesel fuel weighs approximately 7 pounds per gallon (3.18 kg), roughly 14-17% heavier than gasoline.
Why is diesel heavier? Diesel is heavier because its larger molecular structure makes it denser than gasoline, alongside a small energy density.
This can carry some major implications for drivers:
- Fuel Efficiency: While the added weight of diesel reduces the MPG slightly in heavier vehicles, the energy of diesel (BTUs) may provide a greater range.
- Performance: The weight of the diesel fuel may negatively impact acceleration as well as raise the center of gravity of a vehicle, thus causing handling differences.
- Mixing Gasoline with Diesel Risks: Put simply, if you pour gasoline into a diesel engine (or diesel into a gasoline engine), you can have problems. Gasoline has a lower density & will float on top of diesel fuel. This means that the gasoline will clog up fuel systems, cause additional problems, & potentially damage any diesel engine.
To illustrate, when considering a 20-gallon diesel fuel tank, the added weight of 20 gallons of diesel fuel is ~140 pounds, compared to the gasoline fuel tank’s weight, which ranges between 120 & 126 pounds. This could matter if you were worried about towing or payload considerations.
Why Fuel Weight Matters
Knowing how much fuel weighs is not just fun information. A full 15-20 gallon tank can weigh anywhere from 90-126 lbs, depending on the exact size & gasoline blend. A full tank impacts the efficiency & responsiveness of the vehicle dynamics for handling & fuel economy, especially in compact cars.
Weight really matters when it comes to towing because every pound counts towards your vehicle’s payload limit.
We see this example in NASCAR racing, where teams are constantly worried about how much every pound of fuel adds to the race strategy. Plus, understanding gas vs. diesel density helps avoid costly fuel mix-ups at the pump.
Frequently Asked Questions (FAQs)
How much does a gallon of gas weigh?
A gallon of regular gasoline weighs 6 lbs or 2.72 kg.
How much does a gallon of diesel weigh?
Diesel weighs 7 lbs per gallon, roughly 14-17% heavier than gasoline.
How much do 20 gallons of gas weigh?
Twenty gallons of regular gasoline weigh approximately 120-126 pounds, depending on the temperature and blend of the gasoline.
Is water heavier than gas?
Yes, water weighs 8.34 lbs per gallon. Therefore, it is 25-30% heavier than gasoline, which floats on water due to the density difference.
Final Say
Whether you’re towing a trailer for a home improvement project, storing fuel for an off-road trip, or trying to avoid a diesel mix-up, knowing the weight of your fuel keeps you in control of your safety. Perhaps like me, the next time you stop at the pump, you will think of that little fuel jug in a whole new way.
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