Fact of the Week

Together, light vehicles and medium/heavy trucks and buses consume 82.1% of the energy used in the transportation sector. Those on-road vehicles use mainly gasoline and diesel fuel. Of the other modes, air transportation’s use of jet fuel and aviation gasoline accounts for 7.8% of transportation energy use, while water, rail, and pipeline account for less than 5% each.


Graph showing transportation energy use by mode and fuel type in 2014

Fact #953 Dataset


Share of Transportation Energy Use by Mode, 2014

Light VehiclesMed/Heavy Trucks & BusesAirWaterPipelineRailTotal
58.6% 23.5% 7.8% 3.5% 4.2% 2.4% 100.0%


Share of Transportation Energy Use by Mode and Fuel Type, 2014

Fuel TypeLight VehiclesMed/Heavy Trucks & BusesAirWaterPipelineRail
Gasoline 97.0% 9.9% 1.2% 21.0% 0.0% 0.0%
Diesel 2.7% 89.4% 0.0% 30.2% 0.0% 88.4%
LPG 0.3% 0.3% 0.0% 0.0% 0.0% 0.0%
Jet fuel 0.0% 0.0% 98.8% 0.0% 0.0% 0.0%
Residual 0.0% 0.0% 0.0% 48.7% 0.0% 0.0%
Natural gas 0.0% 0.3% 0.0% 0.0% 77.4% 0.0%
Electricity 0.0% 0.0% 0.0% 0.0% 22.6% 11.6%
Total 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

Note: LPG=liquefied petroleum gas. LPG use is small and not visible on the figure.
Source: Oak Ridge National Laboratory, Transportation Energy Data Book: Edition 35, October 2016, Figure 2.6.

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CSA Group publishes recommended practice for CNG storage and delivery systems for road vehicles

At the 2014 Clean Vehicle Education Foundation Critical Issues workshop, participants indicated that industry is lacking an up to date ‘best practices document’ for the design, installation, testing, and maintenance of compressed natural gas (CNG) fuel storage and delivery systems. Although the existing installation codes provide good minimum safety requirements, the representatives at the workshop felt a more comprehensive document would benefit industry.

In 2016, a CNG fuel system standard was also included as a priority on the US Department of Energy and Natural Resources Canada’s Natural Gas Vehicle Work Plan in support of the Regulatory Cooperation Council.

To meet this need, CSA Group recently published a bi-national recommended practice, CSA NGV 6.1 Compressed Natural Gas (CNG) fuel storage and delivery systems for road vehicles, for the North American natural gas vehicle industry. NGV 6.1 provides a Failure Modes and Effects Analysis (FMEA) design approach with guidance and performance based design requirements for CNG fuel storage and delivery systems for road vehicles. 

CSA NGV 6.1 complements CSA Group’s engagement with industry over the past three decades on CNG vehicle component issues including: research and development support, standards development, certification and testing, container inspection, and container end of life. The document provides guidance for the system designer and integrator that includes design requirements and process recommendations.

“The release of CSA NGV 6.1 demonstrates the maturity and sustainability of the CNG vehicle market, and the commitment to quality and safety throughout the natural gas vehicle industry,” notes John Jordan, Technical Representative, Standards of Agility Fuel Solutions and Co-chair of CSA Group’s CNG Fuel storage and delivery system for road vehicles Technical Subcommittee (NGV 6.1). “This recommended practice was truly a collaborative effort from throughout our industry, including but not limited to participation from OEM manufacturers, component manufacturers and government regulators.”

Dan Bowerson, Director, Technology and Development, NGV America and Co-chair of NGV 6.1 reiterates, “NGV 6.1 fills a gap that the NGV industry has been missing for years. By using system engineering practices and starting with a system level FMEA, the NGV 6.1 Technical Committee was able to focus on safety needs of the CNG fuel storage and handling systems. The Technical Committee developed a recommended practice that will be useful for companies or individuals involved in the design and installation of CNG systems and components.”

Source: usgasvehicles

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Alabama Corrections Facilities Save with Propane

The route to alternative-fuel success for the Alabama Department of Corrections (ADOC), a multi-facility group that has realized significant fuel cost savings from switching to propane, starts with the Alabama Clean Fuels Coalition (ACFC).

In 2012, several ADOC officials attended the coalition's Annual Propane Road Show and were inspired by what they saw and heard. Fortified with resources from the ACFC, the corrections officials felt confident enough to propose converting ADOC's fleet of mid-sized vans to propane. The idea caught on immediately, and ADOC teamed with ACFC to plan a two-year pilot project to convert 10 of their 80 gasoline vans to propane.

Four years later, the resulting savings in fuel costs exceeds $6,600 per year per converted van. Since 2014, the vans have driven more than 1.4 million miles on propane with no equipment problems, and the two years' worth of performance data collected has provided valuable data to ADOC beyond cost savings. Topping it off, corrections officials said using the propane vans helped them avert nearly 130 tons of greenhouse gas emissions during the two-year trial.

The road taken by ADOC and partner ACFC to initiate conversion to propane includes the following steps:

  • Prepare with reliable resources and up-to-date information.
    • Thanks to the Alabama Clean Fuels Coalition, ADOC officials said they had the resources necessary—such as industry contacts, educational information, and bi-fuel conversion kit recommendations—to confidently propose switching their fleet to propane.
  • Partner with someone knowledgeable, like a local Clean Cities coalition and their member partners, who can provide technical guidance and expertise.
    • ADOC teamed with ACFC early to plan the two-year pilot project at the Loxley Work Release Center. Later in the project, the coalition helped to develop specifications for bi-fuel propane conversion kits.
  • Assess the costs and benefits.
    • ACFC first conducted an assessment of the miles traveled annually by each van to get to and from work release facilities. With those data, the coalition was able to project that a switch to propane could bring significant savings, based on the cost of each vehicle conversion and the estimated miles per gallon for both gasoline and propane vans.
  • Obtain funding.
  • Take steps to ensure a positive first experience.
    • The first 10 Ford F-350 vans were equipped with bi-fuel liquid propane conversion kits secured through a bid solicitation process with the state's Department of Finance Purchasing Division. When a local auto dealership in Montgomery won the bid, it selected an ACFC member to install the conversion kits on each van. ADOC also received information on fueling station specifications from the Propane Education and Research Council, as well as recommendations on infrastructure contractors from ACFC.

With 55 propane vans recently added to the fleet, propane fueling stations installed at ADOC facilities statewide, and contracts in place with propane marketers to serve the ADOC fleet—with all initial infrastructure costs accounted for—the ADOC is confident it will see continued cost benefits for years to come.


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