Diesel & Natural Gas Generator Fuel Consumption Charts

These charts approximate fuel consumption based on the size of the generator and the generator operating load.

*These tables are intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed.

Diesel vs. Gasoline vs. Natural Gas in Commercial Generators

When powering a commercial facility—whether it’s a hospital, data center, or construction site—choosing the right fuel for your generator is a big decision. Diesel, gasoline, and natural gas each have unique strengths and trade-offs. Understanding these can help you balance cost, reliability, and practicality for your business.

Diesel: The Workhorse

Diesel generators are the go-to for many commercial applications, and for good reason. They’re fuel-efficient, often burning less per kilowatt-hour than gasoline, which translates to lower operating costs over long runtimes. Diesel engines are also built tough, designed to handle heavy loads for extended periods, making them ideal for industries like manufacturing or mining where downtime isn’t an option. Plus, diesel fuel has a long shelf life, so you can store it on-site without worrying about it going stale.

But diesel isn’t perfect. The upfront cost of a diesel generator is typically higher due to its robust construction. It also requires regular maintenance—like fuel filter changes—to prevent issues from contaminants. Emissions are another concern; diesel produces more particulate matter and nitrogen oxides, which may require costly exhaust treatment systems to meet local regulations, especially in urban areas.

Gasoline: The Accessible Option

Gasoline generators are less common in commercial settings but still have their place, particularly for smaller operations or temporary needs, like event venues or small retail spaces. They’re generally cheaper to buy upfront, and gasoline is widely available, so refueling is rarely a hassle. For businesses with intermittent power needs, gasoline can be a practical choice.

The downsides? Gasoline generators are less fuel-efficient than diesel, meaning higher running costs over time. The fuel itself degrades faster, so long-term storage is tricky—think months, not years. Gasoline engines also tend to wear out quicker under continuous heavy use, making them less suited for round-the-clock industrial demands. Emissions are cleaner than diesel but still significant, and fuel volatility raises safety concerns for on-site storage.

Natural Gas: The Clean Contender

Natural gas generators are gaining traction, especially for businesses prioritizing sustainability or operating in areas with strict emissions rules. They burn cleaner than diesel or gasoline, producing fewer particulates and greenhouse gases, which can simplify compliance with environmental regulations. If your facility is already hooked up to a natural gas pipeline, you’ve got a virtually unlimited fuel supply—no need for on-site storage or refueling logistics. This makes natural gas a great fit for hospitals, data centers, or urban commercial complexes.

However, natural gas generators often have a higher initial cost, and their fuel efficiency can lag behind diesel, especially under variable loads. Pipeline dependency is a risk; during natural disasters, gas lines may be disrupted, leaving you without power unless you have a backup fuel source. For remote sites without pipeline access, liquid propane (LP) can serve as an alternative, but that reintroduces storage challenges.

Choosing the Right Fuel

The best choice depends on your operation. Need long-term reliability for heavy loads? Diesel’s your pick. Want a budget-friendly setup for occasional use? Gasoline might do. Prioritizing clean energy with pipeline access? Go for natural gas. Factor in local fuel availability, regulatory requirements, and how often your generator will run. Pairing your decision with fuel consumption data—like the charts on our site—ensures you’re not just powering up, but powering smart.

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