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How Long Will A Generator Run On 5 Gallons Of Gas?

how long will a 12,000 watt generator run on gas

If you think that how long will a generator run on 5 gallons of gas and you didn’t find the answer, don’t worry. We will tell you the answer to this question.

A generator is an electronic device that transfers mechanical energy into electrical energy and is used in the home, outdoor activities, or business. They are frequently used as a backup source during power outages in areas where you don’t expect electricity.

It is important to know how long a generator will run on a specific amount of fuel for planning purposes. So, the question raised here is how long will a generator run on 5 gallons of gas? The information that we gave in our article will be authentic and informative and easy to understand for the individual.

If you understand the fuel efficiency of the Generator, then it will also help save money on fuel costs. Make sure that the Generator is used efficiently. So, we will not waste your time anymore, and let’s dive into it.

Calculation of How Long Will a Generator Run On 5 Gallons of Gas

So, we will tell you the run time of the Generator on 5 gallons of gas through calculation. First of all, we determine the fuel consumption rate of the Generator then we calculate the runtime of the Generator based on the fuel consumption rate. We will also provide an example of this calculation.

Determining the Generator’s Fuel Consumption Rate:

Understanding the fuel consumption rate term is important before calculating the Generator’s run time on 5 gallons of gas. The fuel consumption rate states the amount of fuel the Generator consumes in one hour. The rate will be measured in liters per hour or gallons per hour.

The fuel consumption rate of the Generator depends on multiple factors: load capacity, generator size, and engine efficiency. However, the small Generator has a lower fuel consumption rate than the large one. Similarly, the Generator that runs on full load will consume large fuel oil compared to the Generator which runs on half load.

The manufacturer’s specifications will be consulted if you want to determine the consumption rate of the Generator. This specification gives us information on the fuel consumption rate of the Generator at different load capacities. You can also install the fuel flow meter, which gives you an accurate generator fuel consumption rate.

Calculation of Runtime Based on Fuel Consumption Rate:

Now, you have to determine a generator’s fuel consumption rate, a generator, and then it will be possible to calculate a generator’s runtime on a specific amount of fuel. Now, we will calculate how long will a generator will run on 5 gallons of gas and you can also learn the generator run time chart.

The formula to calculate runtime is Runtime = Fuel Capacity / Fuel Consumption Rate.

Example Calculations of Generator Runtime on 5 Gallons of Gas:

Suppose a generator has a fuel consumption rate of 0.25GPH and a fuel capacity of 5 gallons.

So, according to the formula:

Runtime= Fuel Capacity / Fuel consumption rate

               = 5 / 0.25

Runtime= 20 Hours

The answer shows that the Generator can run for 20 hours on 5 gallons of gas.

Factors Affecting Generator Runtime on 5 Gallons of Gas:

Here, we will discuss the few factors that affect the runtime of the Generator on 5 gallons of gas. We will also tell you each factor’s impact on how long will a generator run on 5 gallons of gas.

Generator Type and Size:

The type and size of the Generator are the important factor that affects the Generator’s runtime. As I mentioned, the Generator that consumes less fuel will give you longer runtime than the Generator that consumes large fuel. In short, a 10,000W generator runs faster than a 2,000W generator.

How Long Will A Generator Run On 5 Gallons Of Gas

In addition, inverter generators are more fuel efficient and have longer run times than conventional generators.

Power Load:

The amount of electric load and power load that your Generator is powering will also affect the runtime of the Generator on 5 gallons of gas. Because the higher the power load, the Generator will consume more fuel, and the runtime will ultimately be short. In short, running your generator on 100% output running wattage will burn 5 gallons of gas quickly as you run it on 50% running wattage. 

The impact of power load on how long will a generator run on 5 gallons of gas will be that a generator that runs on full load will have shorter runtime than the Generator that runs on half load.

Fuel Efficiency:

Another factor is fuel efficiency, which affects how long a generator will run on 5 gallons of gas. This factor states that a generator with high fuel efficiency will take less fuel and give long runtime.

But if a generator has less fuel efficiency, it will give you short runtime. The impact of fuel efficiency on how long will a generator run on 5 gallons of gas is that the higher fuel efficiency generator will run more time than the less efficient.

Fuel Tank Capacity:

It is the amount of fuel a generator can hold simultaneously. So, the larger the fuel tank capacity, the greater the runtime a generator will provide you on a single gas tank. The Generator with a larger fuel tank capacity will run longer on 5 gallons of gas than a generator with a smaller tank capacity.

Fuel Type:

The type of fuel the Generator uses also affects the generator runtime on 5 gallons of gas. Generators can run on different fuels like gasoline, diesel, propane, or natural gas. The energy content of each fuel depends, and some fuels are more efficient than others.

The fuel type can affect the fuel efficiency and runtime of the Generator on 5 gallons of gas. For example, natural gas or propane might be more efficient and provide a longer runtime than gasoline.

Choice of fuel: Gasoline vs. Propane:

When we talk about generators, the fuel choice significantly impacts how long they run on 5 gallons. Many generators run on gasoline, which is readily available and easy to store. On the other hand, propane has become a famous alternative because of its clean-burning nature and longer lifetime.

Propane burns cleaner than gasoline and is less likely to gum up on the carburetor, which exceeds the life of the Generator. In addition, propane has a larger shelf life than gasoline, which means you can store it for a long period without worrying that it will go bad.

The question raised here is how long will a 12,000-watt generator run on propane. So the answer will be 36 hours.

However, the impact of these fuel choices is that the generators running on propane tend to have a longer runtime than those running on gasoline. Propane is more fuel efficient, which means you can have more hours of use except for 5 gallons compared to gasoline.

Want To Increase the Runtime of Your Generator? Follow these Tips:

If you want to increase the runtime of your Generator, then we have some tips for you. If you follow that, you will get a positive result. We used these tips to increase our generator runtime, so that’s why we recommend these tips to you.

Regular Maintenance of the Generator:

The maintenance of a Regular Generator can help it run more efficiently, consume less fuel, and increase the runtime on 5 gallons of gas. A few Tasks, such as changing the oil, cleaning the air filter, and keeping the spark plugs clean, fall into this category.

Regular Maintenance of the Generator

Use of Energy-Efficient Appliances:

Using energy-efficient appliances can assist in decreasing the Generator’s power load and increase the runtime on 5 gallons of gas. Energy-efficient appliances are designed to use less power, which means they use less fuel.

Reduction of Power Load:

Turning off useless appliances or devices can improve the runtime on 5 gallons of gas by reducing the electrical strain on the Generator. For example, turning off lights and eliminating electrical gadgets that are not in use can help decrease the total power load on the Generator.

Use of Fuel Additives:

Using gasoline additives can improve the Generator’s efficiency and expand the runtime on 5 gallons of petrol. Fuel additives serve the purpose of increasing fuel quality and helping the Generator in the running more effectively.

Proper Storage of Fuel:

Proper fuel storage can ensure that it is used for an extended period, enhancing the runtime on 5 gallons of petrol. This can involve using a fuel stabilizer, storing the fuel in a cold and dry area, and storing the fuel in a container made specifically for fuel storage.

Selecting the Right Generator for your needs:

Choosing the correct Generator for your needs might help you avoid using more fuel than necessary to power your appliances and devices. Choosing a properly sized generator for your power requirements will help you get more mileage out of 5 gallons of gas.

Running a Generator on 5 Gallons of Gas:

We consider gas the best fuel source because of its accessibility and efficiency. You can take access amount of fuel for your Generator so that you don’t need to find a gas station to refill your Generator. Although, a gas can be dangerous to carry because it is extremely flammable and dangerous if you store it for a long time and too much in one place.

Gas is expensive in most countries, so you should know what you pay. How long a generator will run on 5 gallons of gas differs for various types of generators and depends on their sizes.

A generator of 5,000W will run on 28 gallons of gas for 24 hours, and you know that 18 gallons will be too expensive for a middle-class person. Another thing you need to consider is how much is going to be plugged into your Generator. Because the more your Generator runs, the shorter the run time your Generator will be.

If you want your Generator to run for a long time, limit how much you are running your Generator. If we answer the question, which is how long a generator will run on 5 gallons of gas, then on average, it will be 8 hours at least. Although, some generators run more than this period and depend on the above factors.

The Lifespan of a Generator:

When you purchase a generator, it comes with a list of specifications you take from the manufacturer. The list includes information about the generation: maintenance, specialized instructions, and advice run time.

All information should be followed to ensure you increase your Generator’s lifespan. You should change the oil, filter, and starting plugs at the initial stage to keep it running well. The manufacturer also told the runtime of the generator that how much time he will run continuously.

The runtime they told will be a lifetime of a generator. It means that some generators run only 100 hours in their whole life. On the other side, some generators run 1000 hours. Diesel-type generators run for longer as compared to gas-type generators.

Try to purchase a Generator with a large gas tank because this type doesn’t need fuel repeatedly. You need to ensure no leakage or any other fault in your Generator. Also, ensure that the fuel level of the Generator is fresh and check the fuel level.

Different Generators Running on Different Levels of Gas

As we mentioned above, storing a large amount of gas in your home is unsafe because it has a negative impact on generators, so you should store less gas. However, the common availability of gasoline makes it more beneficial as a fuel source, and it is more expensive and less quickly consumable than oil.  

A portable generator having 5,000 watts of power will run only for 24 hours on 18 gallons of gas. So, there are more efficient methods for sustainability and price.

Traditional Generators:

These generators use fuel to power the engine and connect to the alternator, which generates electricity. The conversion of AC to DC power and then the inversion into clean AC will affect the same technology that your utility company provides.  

These are the larger contraptions that power the entire home if needed. Situations that demand a lot of power, like building sites and weekend-long projects, could benefit from traditional generators. They are heavy and bulkier, so consider these terms when you purchase.

Inverter Generators:

These generators are the most efficient in terms of power consumption that electronically stop the engine from meeting the power demands over running at full capacity. Inverter generators are quieter, and they produce low emissions as compared to standard generators.

Inverter Generators

 These machines of lightweight quality provide profitability and easy setup no matter when you require power. They can also combine with other inverter generators if extra power is required. However, the runtime of inverter generators ranges from 6 to 12 hours, and they will not shut down after 20 minutes.

Bonus Tips for Increasing the Life of Your Generator

To extend the life of your Generator, follow these five bonus tips.

  • Check Oil Level:

It would be best to keep the oil level always topped off to stop wear and tear on the engine.

  • Keep it clean:

You must use a soft brush and mild detergent to clean the Generator regularly. Ensure the fan blades surrounding the motor are cleaned of dust, dirt, or debris.

  • Use a Surge Protector:

Remember that you should plug the sensitive electronics into a surge protector that will protect them from voltage surges or spikes. This is only for generators but for all the electronic equipment available in your home. 

If you want to know what is surge protector then you can learn from here.

  • Maintain Proper Distance:

Place the Generator in a range of 2 feet; no other object is placed.

  • Avoid Overloads:

Only run a few appliances simultaneously because it loads so much on Generator. This will cause less life for your Generator and decrease the runtime of your Generator also. Putting so much load on the Generator will also cause your Generator to shut off after 20 minutes.


Suppose you have a generator and wonder how long will a generator run on 5 gallons of gas. In that case, the answer varies on multiple factors such as the Generator’s fuel consumption rate, type and size, power load, fuel efficiency, fuel tank capacity, and fuel type.

To identify how long a generator runs on 5 gallons of gas, you need to calculate the fuel consumption rate of the Generator, which is the amount of fuel it consumes in one hour of operation. This rate can get from the manufacturer’s specifications or by installing a fuel flow meter.

Once you have determined the fuel consumption rate, you can calculate the runtime of your Generator on 5 gallons and get the answer: how long will a generator run on 5 gallons of gas? Generally, a smaller and more fuel-efficient generator will run longer on 5 gallons of gas than a larger and less efficient one.

Similarly, running your Generator on half load instead of full load can increase its runtime on 5 gallons of gas. Lastly, using a generator with a larger fuel tank capacity or one that runs on a less fuel-hungry fuel type can also increase its runtime.

Frequently Asked Questions: How long will a Generator Run on 5 Gallons of Gas?

How many gallons of gas does a generator use per hour?

Gasoline is the most typical fuel source that is used for portable generators. A standard generator of 5 kilowatts will commonly consume about 0.75 gallons per hour.

Can a generator be run 24 hours a day?

A generator will likely run continuously as long as it has fuel. Although, some fuels may be more difficult to obtain in a continuous supply during emergencies or natural disasters. So, it would be best to have your Generator as long as you have access to the fuel needed to run it.

How long can a generator run non-stop?

Although the answer to this question depends on various factors, including size, fuel source, and the generator’s model, portable gasoline-powered generators will run 6 to 16 hours continuously non-stop. On the other hand, portable generators that are powered by propane will run for about 150 to 200 hours continuously.

How long will a 5500-watt generator run on a tank of gas?

The generator will run for 10 hours on gasoline.

Does a generator use more gas with more things plugged in?

Yes, you can use but remember that the generator will consume more power.

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