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Natural Gas Vehicles .pdf

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Heavy Duty Vehicles
Public and private fleets have more and more choices for heavy duty vehicles. Heavy duty vehicles can
be dedicated OEM (Original Equipment Manafacturer) natural gas, dual fueled (natural gas-diesel blends)
or natural gas repowers. With the same power as gasoline or diesel fuel, natural gas can be used in
transit buses, semitrucks, school buses, waste disposal trucks and delivery vehicles.
Depending on the fleet's application and route, fleets can chose either Compressed Natural Gas (CNG) or
Liquefied Natural Gas (LNG) vehicles. CNG is stored as a high pressure gas while LNG, a more
expensive option, is a kryogenic liquid. Because it is a liquid, the energy density of LNG is greater than
CNG, so more fuel can be stored onboard the vehicle. This makes LNG well-suited for Class 7 and 8
trucks requiring a greater range.

OEM: Original Equipment Manafacturer
Currently, Cummins produces two dedicated heavy duty natural gas engines (8.9 Liter and 11.9 Liter).
These engines are found in refuse trucks to long haul freight carriers. These engines are available in all
major trucks platforms. Cummins is in development of the 6.7 Liter geared for the Type C front engine
school bus and medium duty vocational trucks.

Dual Fuel Engines:
Dual Fuel Systems blends natural gas into your existing diesel engine through the turbocharger. The
systems result in a lower cost of diesel and a reduction in emissions. You can run 50% or more Natural
Gas while retaining the ability to operate on 100% diesel when you need it.
Repowered Engines:
For fleets who want to make a switch to natural gas, but they can't swallow the initial investment,
repowers are a great way to go. For certain International Navistar DT-466 and Mack E7 engines, fleets
can replace their dirty diesel engine with an approved EPA certified NGV Natori or Omnitek systems.
These natural gas repowers provide fleets an economical way to become green.
Light & Medium Duty

When it comes to light and medium duty natural gas vehicles, fleets have many options. First, fleets can
choose from Original Equipment Manufacturer vehicles straight from the Factory, or they can choose to
convert their new or existing gasoline vehicles with an EPA approved conversion kit. Incremental costs
for light duty natural gas vehicles can range from $8,500 to $11,000 depending on the tank configuration
and size. Depending on the fleet's application, these vehicles can be dedicated (running only on natural
gas) or bi-fuel (running on both gasoline or natural gas).
For a list of available natural gas vehicles, please visit http://www.houstonngvalliance.org/.

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