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The Natural Leader: Cummins Westport

Cummins Westport natural gas engines are the best-selling alternative fuel engines for regional-haul, transit bus, refuse, mixer and dump truck applications. In April 2016, in addition to the ISL G and the ISX12 G, the ISB6.7 G and ISL G Near Zero natural gas engines will be available. The ISL G Near Zero is the first engine certified to Air Resource Board (ARB) optional low oxides of nitrogen (NOx) levels – 90% lower than the current U.S. Environmental Protection Agency (EPA) standards.

For on-highway markets, the ISL G and ISL G Near Zero ( up to 320 hp) is powerful enough to handle transit buses and local delivery, refuse and commercial trucks up to 66,000 lb GVW. Fleets with heavier loads (up to 80,000 lb GVW) should spec the ISX12 G (up to 400 hp). The ISB6.7 G (up to 260 hp) is ideal for medium-duty trucks transit, shuttle and school bus applications.

The growing popularity of Cummins Westport natural gas engines has encouraged a 50% increase in the number of compressed natural gas (CNG) and liquefied natural gas (LNG) fueling stations across North America, with over 1,500 such stations in operation currently. Many Fortune 500 companies are increasing the number of natural-gas-powered vehicles in their trucking fleets, including the United Parcel Service (UPS),® FedEx,® Coca-Cola,® Kroger,® Lowe’s,® Costco® and Nestlé.®


One reason for the interest in natural gas engines is cost efficiency. Even with the recent decrease in diesel prices, natural gas still has a significant cost advantage (about 35 cents per gallon) over its petroleum-based alternative, as measured in Diesel Gallon Equivalent (DGE) pricing as of November 2015.

Furthermore, the fact that natural gas is domestically sourced and readily available has a big economic impact. With over 350 trillion cubic feet of natural gas reserves on its land, the United States has enough natural gas to last well into the next century at current consumption levels.

The inherent cleanliness of natural gas combustion yields another significant benefit. All three Cummins Westport natural gas engines for the on-highway market (the ISB6.7 G, ISL G/ISL G Near-Zero and ISX12 G) utilize our patented Three-Way Catalyst (TWC) – a totally passive device that replaces the muffler, needs no fluids or regeneration events and requires no maintenance. So those engines are simpler to operate and maintain as well as attractive for duty cycles with prolonged idle time and operation in urban routes.

The ISL G Near Zero is the first engine certified to near zero ARB levels of .02 NOx and 470 grams/hp-hour of greenhouse gas (GHG) emissions. Natural gas continues to demonstrate its benefits by achieving equivalent low emission levels in a more cost-effective way than fully electric transportation vehicles. The ISL G Near Zero will be available in 2016. Learn what makes Cummins Westport engines the natural choice for the future, at

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