How Much Gas Does a Generator Use (Find Out) 2023

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Topic: How Much Gas Does a Generator Use?

Generators provide backup power in the event of a power outage, but the electricity they produce isn’t free. How much gas does a generator use?

It depends on the size of the generator, how much power it needs to produce, and how you use it.

Here’s everything you need to know about your generator’s gas usage, including how to reduce its impact on your budget while maintaining your safety.

How Much Gas Does a Generator Use

The Different Types of Generators

How much gas does a generator use? Depending on the type of generator, usage will vary. The most common type of generators is standby, portable, and inverter generators.

Standby generators are the largest and most powerful type of generator. They’re permanently installed outside your home or business and typically run on natural gas or propane.

Portable generators are smaller and can be moved from one location to another. They typically run-on gasoline, although some models can run on propane. Inverter generators are the smallest and most lightweight type of generator.

They produce clean power that’s ideal for sensitive electronics like laptops and phones. And like portable generators, they usually run-on gasoline.

Standby generators typically run on natural gas, propane, or liquid petroleum and will typically operate for 16 to 24 hours on one tank of fuel.

Portable generators can vary dramatically in how much gas they consume, depending on how often you run them and how big they are.

If you have an inverter model that runs off gasoline, it’ll also consume more fuel than standard portable models because it has more electronics and cooling mechanisms that take up energy.

How Much Gas Will My Generator Use?

Wondering how much gas your generator will use? Check out this quick guide to help estimate fuel consumption.

Gasoline generators typically use between 0.6 and 1 gallon per hour, while propane generators use about 0.4 gallons per hour.

So, if you have a 10,000-watt generator, it would use between 10 and 20 gallons of gasoline per day or 4 to 8 gallons of propane.

If you run the generator for 24 hours straight, that’s 240 to 480 gallons of gas! Luckily, it’s usually not recommended to run a generator for more than 6 hours at a time.

However, keep in mind that there are other factors such as how old the generator is and how dirty the air filter is.

All these factors can affect how much gas your generator uses. The higher the voltage, the less gas a generator needs to produce more power.

And depending on what type of fuel your generator runs on; it could be possible to use even less. For example, some generators need less oil when running on natural gas rather than propane or gasoline.

That means an efficiency rate of up to 30% better! Keep all these things in mind when estimating how much gas your generator will use so you don’t find yourself with too little left over after an emergency.

Fuel Cost Considerations

When operating a generator, fuel costs are an important consideration. Depending on the size and power of the generator, as well as how long it is run, fuel usage will vary.

To get an estimate of how much gas your generator may use, consider its wattage rating and how long you plan to operate it.

In general, the higher the wattage rating, the more fuel the generator will consume.

Additionally, running the generator for extended periods will also result in higher fuel usage.

Based on these factors, you can determine approximately how much gas your generator will use and budget accordingly.

For example, if you have a 3000-watt generator and expect to only be using it for a few hours at most per day, then one gallon of gasoline should last for about 20 days’ worth of operation.

However, if you’re using a 2000-watt generator that is expected to be used all day each day, then one gallon would only last about 7 days’ worth of operation.

Run Time Considerations

As you can see, the answer to how much gas a generator uses depends on many factors. If you are considering using a generator, it’s important to factor in run time when making your decision.

A generator that uses less fuel may be more expensive upfront, but it will save you money in the long run.

Consider how often you’ll need to use the generator and how long you’ll need it to run each time. Also, keep in mind that some generators are more fuel-efficient than others.

Doing your research before making a purchase can save you money and hassle down the road. It is worth taking the time to determine how much gas your generator needs based on how often you plan to use it.

By doing so, you can choose a model that works for both your budget and your needs.

Off-Grid Systems

If you’re looking to be completely independent of the grid, you’ll need to factor in how much gas your generator will use.

For most people, an off-grid system is not feasible because of the high cost and maintenance required. However, if you’re determined to go off-grid, there are a few things you need to know.

First, you’ll need to determine what size generator you’ll need to power your home.

The average home uses about 10,000 watts of power, but this can vary depending on the size of your home and how many appliances you plan to run simultaneously.

Most generators have a 20-gallon tank and will burn about 1 gallon of gas per hour when running at full capacity.
That means that it would take around 24 hours for a generator to go through its fuel supply and then it would need more gas.

A small portable generator might hold around 4 gallons of fuel while larger generators might hold as much as 16 gallons.

So how long will your fuel last? Again, this depends on how often you use the generator.

Comparison: Diesel vs Natural Gas Generators

The first thing you need to do is determine what type of generator you have. Diesel generators are usually more fuel efficient than natural gas generators.

However, both types of generators use a fair amount of gas. How much gas your generator uses will depend on its size and how often you use it.

The best way to find out how much gas your generator uses is to consult the owner’s manual.

If you don’t have access to this, then call the manufacturer and ask them how much gas their generator uses per hour or gallon.


There are several ways to calculate how much gas your generator may use. The easiest way is to use the amount of fuel you have in your tank and the number of hours you run the generator. If you’re planning to use your generator for more than 8 hours per day, you should consider buying an auxiliary tank.

You can purchase a portable generator that can run on gasoline, diesel, or natural gas. It’s also important to note that if you run your generator at full capacity, you can burn up to 4 gallons of gas in just 2 hours.