Diesel generator is one of the most commonly used types of generators. They are used in a variety of applications, including backup power for homes and businesses and as primary power for construction sites and other remote locations. Diesel generators are available in various sizes and power output levels. Diesel-powered generators are typically more fuel-efficient than gasoline generators, producing fewer emissions.

If you’re considering purchasing a diesel generator as an automatic standby generator, it’s crucial to understand how much fuel it will consume.

This article will tell you everything you need to know about diesel generator fuel consumption.

We’ll discuss the factors that affect fuel consumption, how to calculate your generator’s fuel needs, and why you should switch to diesel fuel.


Diesel Fuel Consumption Chart

Diesel generators are very efficient but can be expensive to operate if not used tactfully. The best way to use a diesel generator is to load it up with as much work as possible. This will minimize the time the engine is running and maximize its efficiency.

The fuel consumption chart is an approximate diesel fuel consumption chart that helps you understand how much fuel your generator uses under different loads.

The larger your generator load, the more significant amount of fuel it will consume.

The first column shows the size of the generator, and the remaining columns show the corresponding fuel consumption in gallons per hour at varying loads.



Generator Size (kW) 25% Load 50% Load 75% Load 100% Load
20 0.6 0.9 1.3 1.6
30 1.3 1.8 2.4 2.9
40 1.6 2.3 3.2 4.0
60 1.8 2.9 3.8 4.8
75 2.4 3.4 4.6 6.4
100 2.6 4.1 5.8 7.4
125 3.1 5.0 7.1 9.1
135 3.3 5.4 7.6 9.8
150 3.6 5.9 8.4 10.9
175 4.1 6.8 9.7 12.7
200 4.7 7.7 11.0 14.4
230 5.3 8.8 12.5 16.6
250 5.7 9.5 13.6 18.0
300 6.8 11.3 16.1 21.5
350 7.9 13.1 18.7 25.1
400 8.9 14.9 21.3 28.6
500 11.0 18.5 26.4 35.7
600 13.2 22.0 31.5 42.8
750 16.3 27.4 39.3 53.4
1000 21.6 36.4 52.1 71.1
1250 26.9 45.3 65.0 88.8
1500 32.2 54.3 77.8 106.5
1750 37.5 63.2 90.7 124.2
2000 42.8 72.2 103.5 141.9
2250 48.1 81.1 116.4 159.6


How To Determine a Generator’s Fuel Consumption

When it comes to choosing a generator, one of the most important factors to consider is fuel consumption. There are a few different ways to determine a generator’s fuel consumption, and your method will depend on your specific needs.

One way to determine fuel consumption is by using the manufacturer’s specifications. Every generator has different fuel consumption rates, so this is the most accurate way to compare generators. However, keep in mind that these numbers are often based on ideal conditions and may not reflect real-world usage.

Another way to estimate fuel consumption is by using a fuel calculator. These calculators consider factors like load size, runtime, and environmental conditions to give you a more realistic estimate of fuel consumption.

Finally, you can also ask other generator owners for their experiences with various models.

What’s the Difference Between Gas and Diesel?

Diesel and gasoline engines are very similar in many ways. Both use spark plugs to ignite a fuel-air mixture, pistons that move up and down in cylinders, and crankshafts to convert linear motion into rotary motion.

However, there are also some key differences between these two types of engines.

For one thing, diesel engines tend to be more durable and require less maintenance than gasoline engines. This is because diesel fuel is less likely to “knock” or “ping,” which can cause engine damage. In addition, diesel engines typically have higher compression ratios, which means they can extract more energy from the fuel-air mixture. As a result, diesel engines are usually more efficient than gasoline engines.

Why Should You Switch to Diesel Fuel?

Diesel generator power solutions are top-rated and have many advantages over gasoline generators. They are more fuel efficient, produce more power, and last longer.

Here are four reasons why you should switch to diesel fuel for your generator:

1. Diesel generators are more fuel-efficient than gasoline generators.

Diesel engines tend to be more efficient than gasoline engines, and that efficiency translates to lower fuel costs over the long term. If you’re looking for a generator that will save you money on fuel over its lifetime, diesel is the way.

Of course, diesel generators also tend to cost more upfront than gasoline models. But diesel is the more cost-effective choice if you’re looking at long-term savings. Your value for money is guaranteed in the long term.

2. Diesel generators last longer than gasoline generators.

Diesel generators are built to last and perform at a high level. They are designed for heavy-duty use and can handle being run for long periods. This makes them ideal for emergency situations when power outages can last for days or weeks. The Diesel generators’ longevity of performance is impeccable. On the other hand, gasoline generators are not built to run for as long, and their fuel tanks need to be filled more often. They also produce more emissions than diesel generators, so they are not as environmentally friendly.

3. Diesel fuel is less expensive than gasoline.

Diesel fuel is less expensive than gasoline, making it a popular choice for those who use generators. While diesel generators are more costly to purchase, they are cheaper to operate and maintain. This is important for those considering long-term value for money. Diesel fuel is also more efficient than gasoline, so you’ll get more power out of your generator.

4. Diesel Generators are safer to use

Unlike Gasoline generators, diesel engines start with compression that significantly reduces the risk of an explosion when turned on.

Diesel is also less flammable when compared to other fuels like gasoline.


Why do some engines burn more fuel than others at the same load?

As you may already know, Diesel generators are used in a variety of applications, from powering homes to businesses to entire factories.

While they are all similar in how they operate, some engines may burn more fuel than others at the same load.

There are a few reasons why this may be the case.

1.     One reason is that different engines have different efficiencies. Some engines may be able to convert more of the fuel’s energy into usable power, while others may waste more of it as heat.

2.     Another factor is that different engines may have different compression ratios. A higher compression ratio means more fuel is burned in a given cycle, leading to higher fuel consumption.

3.     Cooling fans and the water pumps of generator sets also impact fuel consumption. For instance, a 200kW generator will burn more fuel at 20kW than a 20kW generator set.

4.     Finally, engine operating conditions can also affect fuel consumption. For example, if an engine is operated at a lower temperature, it will tend to burn less fuel.


Can I believe the manufacturer’s spec sheets regarding fuel consumption?

As a general rule, you can trust the manufacturer’s spec sheet when it comes to fuel consumption.

However, there are some important caveats to keep in mind.

First and foremost, different manufacturers use different testing standards.

This means that direct comparisons between two models from different brands may not be entirely accurate.

Second, even within the same brand, there can be variation in fuel consumption between individual units of the same model.

This is due to things like manufacturing tolerances and individual operating conditions.

Again, there are no established standards that govern how manufacturers measure the consumption rates of generators.

Finally, remember that the manufacturer’s spec sheet is based on ideal conditions, and some external factors may affect the values in the specifications.


Right from the onset of your generator installation, it is essential to know how much fuel your diesel generator is consuming. By monitoring your fuel consumption, you can ensure that your generator is running efficiently and not wasting fuel.

Additionally, by understanding your fuel consumption, you can plan for fuel costs and ensure that you have enough fuel on hand to power your generator during an emergency.