The Cummins Inc. X15N is the most powerful natural gas engine Cummins has ever built, with a broad engine torque curve to provide flexibility for various heavy-duty applications.

The X15N weighs less than our current X15 diesel and has power ratings up to 500 hp and torque up to 1850 lb-ft, helping heavy-duty fleets start reducing their transportation emissions today, without sacrificing capability. The engine integrates seamlessly with existing service networks and practices, leading to a high level of parts commonality as new platforms enter the market.

Our 15-liter natural gas platform underwent rigorous testing prior to launch, including (6) years of research and development, 40,000 hours of in-house and overload testing, and six (6) million miles of on road testing. We now have more than 50,000 global production engines running outside North America with more than two billion miles of combined driving, hauling general freight up to 110K lbs. gross vehicle weight.

 For the North American X15N, the validation process included engine dyno testing, U.S. EPA and CARB Omnibus Low NOx emissions certification, abuse testing, and more than two dozen customer field test trucks accumulating nearly two million miles across a variety of applications, duty cycles and terrains.

So how good is the X15N? See what our customers have to say about it.

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Werner Enterprises

A leading trucking company specializing in freight shipping and logistics management 

Company Profile: 

• Operates more than 8,000 TTS Trucks¹ 
• Named a 2024 Top Green Fleet by Heavy Duty Trucking² 
• Aims to reduce greenhouse gas emissions by 55% by 2035³  

Quote: 

“As a top five truckload carrier in North America, we are committed to implementing sustainability initiatives creating long-lasting and industry-wide impacts. These [X15N powered] vehicles can greatly reduce emissions when running renewable natural gas, and we are eager and willing to help validate this new technology.” ⁴  

- Derek Leathers, Chairman, President and CEO, Werner Enterprises 

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United Parcel Service (UPS)

Global shipping and logistics solutions provider 

Company Profile¹: 

• Operates more than 340,000 fleet assets across 200 countries and territories 
• 22.3 million packages delivered daily²  
• 4,500 natural gas tractors 
• Goal to reduce CO₂ per package by 50% compared to 2020 baseline 

Quote: 

“We’re thrilled to be the first company to acquire the T680 with the X15N 15-liter natural gas engine. This new truck enhances our worldwide fleet of over 18,000 alternative fuel and advanced technology vehicles, which are essential for achieving our target of 40% alternative fuel in our ground operations by 2025 and carbon neutrality by 2050.” ² 

- Anthony Marshall, VP of Maintenance and Engineering, UPS 

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Food Express, Inc. (FXI) 

A family owned and operated trucking company specializing in the transportation of food grade dry bulk commodities in the Western United States. 

Company Profile: 

• Operates more than 300 tractors and 450 trailers¹  
• Fleet includes 88 trucks operating on renewable natural gas² 

Quote: 

“The addition of the new truck with Cummins’ latest clean technology [X15N] into our fleet falls nicely into our decarbonization plans. Having the power and torque of a larger engine is ideal for many of our routes, and it is an added benefit for it to operate with an ultra-low carbon fuel like RNG.”² 

- Kevin Keeney, President of Food Express 

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C.A.T. Inc. 

One of North America’s largest and fastest growing transportation companies serving top tier customers across Canada, The United States & Mexico. 

Company Profile¹: 

• Operates 1800 tractors and 5500 trailers¹  
• 125 million miles driven per year 
• Among the first fleets to make major investments in Compressed Natural Gas (CNG) technology, starting with 100 CNG trucks in 2014 

Quote: 

“The 15-liter [X15N] has been performing great. So far from what we’ve seen, the horsepower and torque is comparable to diesel. If you do things right, it’s a technology that is working and has been proven. CNG and RNG is the only alternative energy available on the market that we can apply now.”² 

- Jonathan Royal, Senior Director of Asset Management for C.A.T. 

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Groupe Robert 

A logistics company that offers a variety of services to customers in North America, including warehousing, transportation, and order fulfillment. 

Company Profile: 

• 1,000 tractors and 3,000 trailers  
• More than 150 vehicles powered by natural gas¹ 

Quote: 

“At Robert, we have great expertise with Eaton automated transmissions and with the Endurant/CNG engine combination. We know that a natural gas truck reacts differently than a diesel. The efficiency we obtain with the X15N is very comparable to what we have with the equivalent diesel engine.” 

- Kevin Lambert, Sector Manager, Motorized Equipment and Permits, Groupe Robert 

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Ozinga Energy 

A leader in Compressed Natural Gas (CNG) solutions in the Midwest and California. 

Company Profile: 

• Operate the largest public CNG/RNG fueling network in Chicagoland 
• Using the X15N to haul milk tankers in Arizona  

Quote: 

“We’re mooooooo-ving ahead with the new and innovative Cummins Inc. X15N engine! Powered by RNG [dairy gas], this big block engine is proving its capabilities!”¹ 

- Rich Mulder, Director of Logistics, Ozinga Energy LLC 

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Star Quality Concrete 

Bulk cement hauling fleet based in San Jose, California 

Company Profile: 

• One of the concrete industry’s top CNG fleet operators¹ 
• Operating CNG trucks since 2010 
• Approximately 72,000 miles driven with X15N field test truck² 

Quote: 

“We are thrilled with the performance of the Cummins X15N engine paired with the Allison 4000 Series transmission and the potential impact it could bring to our fleet of over 100 natural gas trucks. The field testing has been flawless over 50,000 miles. The enhanced engine braking and consistently stronger power during shifting have significantly improved our operations.” 

- Victor Landaverde, Fleet Manager, Star Quality Concrete 

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J.B. Hunt 

Provides a variety of freight transportation services to customers throughout the United States, Canada, and Mexico 

Company Profile: 

• Started in trucking with the purchase of five trucks and seven trailers in the 1960s¹ 
• Has grown into North America’s largest intermodal fleet 
• Has a goal to reduce carbon emission intensity by 32% by 2034 (compared to 2019 baseline)² 

Quote: 

“We are excited to be the first carrier in Clean Energy’s pilot program and to get hands-on experience with the Cummins X15N tractor. Vehicles powered by renewable natural gas produce significantly less carbon emissions throughout their lifecycle and are more compatible with today’s available infrastructure than most competing emissions reduction technologies.”³ 

- Greer Woodruff, executive vice president of safety, sustainability and maintenance at J.B. Hunt