Study of stingray swimming could improve underwater vehicles

BUFFALO, N.Y., Nov. 13 (UPI) -- Mimicking the swimming expertise of stingrays could improve the agility and fuel efficiency of unmanned underwater vehicles, U.S. engineers say.
Boeing to increase B-52 smart weapon capacity

Boeing to increase B-52 smart weapon capacity

OKLAHOMA CITY, Nov. 7 (UPI) -- The smart weapons capacity of B-52 bombers is to be expanded by 50 percent under a new $24.6 million contract to Boeing from the U.S. Air Force.

Alcoa, Army developing aluminum hull for combat vehicles

PITTSBURGH, Oct. 23 (UPI) -- A single-piece aluminum hull for ground combat vehicles that would improve blast protection is to be developed by Alcoa and the U.S. Army Research Laboratory.
New helicopter engine undergoes testing

New helicopter engine undergoes testing

WASHINGTON, Oct. 22 (UPI) -- A 3,000 horsepower turboshaft engine, designed for use primarily on UH-60 and Apache-64 military helicopters, has successfully completed endurance testing.

Rolls-Royce opens outdoor jet engine test facility

BAY ST. LOUIS, Miss., Oct. 16 (UPI) -- An expanded outdoor jet engine test stand has been opened at NASA's John C. Stennis Space Center in Mississippi by Rolls-Royce North America.

Energy Dep't: U.S. light-duty fuel economy has risen dramatically

WASHINGTON, Oct. 11 (UPI) -- Fuel economy for light-duty vehicles in the United States doubled since the 1970s and should increase by another 50 percent by 2040, a U.S. energy agency said.

Natural Resources Council cites 'real progress' on U.S. climate goals

WASHINGTON, Sept. 27 (UPI) -- The president of the Natural Resources Defense Council said the United States is making "real progress" on cutting pollution but more work can be done.

Rolls-Royce engine enhancement gets FAA certification

NATIONAL HARBOR, Md., Sept. 17 (UPI) -- Rolls-Royce's enhancement of the T56 engine used on C-130H aircraft has received a U.S. Federal Aviation Administration type certificate, the company said.

New U.S. cars reach record for fuel efficiency

ANN ARBOR, Mich., Sept. 10 (UPI) -- The auto industry and cost conscience consumers pushed fuel efficiency among new cars sold in the United States to a record high in August, a study found.

World demands less of OPEC crude

VIENNA, Sept. 10 (UPI) -- The Organization of Petroleum Exporting Countries said Tuesday demand for its crude oil decreased in August while non-OPEC oil supply increased.
U.S. gasoline consumption declined in first half of 2013

U.S. gasoline consumption declined in first half of 2013

WASHINGTON, Sept. 6 (UPI) -- Increased fuel efficiency was the likely cause of lower gasoline consumption in the first half of the year, the U.S. Energy Department said.
U.S. Energy Department allocates $45 million for fuel efficiency

U.S. Energy Department allocates $45 million for fuel efficiency

WASHINGTON, Sept. 5 (UPI) -- The U.S. Energy Department announced it was designating $45 million for research and development projects aimed at improving fuel efficiency.

Japan's new auto sales slip 1.1 percent in August

TOKYO, Sept. 3 (UPI) -- Japan's domestic new automobile sales slipped 1.1 percent in August year-on-year to 366,754 units, the country's dealers association said.

Bombardier lines up tentative deal to sell 50 airliners in Russia

MONTREAL, Aug. 28 (UPI) -- Canadian aircraft maker Bombardier Aerospace said Wednesday it has signed a letter of intent with a Russian company for 50 jetliners worth about $1.7 billion.

AutoOutlook: Ford lowers C-Max mpg rating, GM suspends ops in Egypt

U.S. automaker Ford Motor Co. said this week it will lower the fuel efficiency rating on the C-Max, a hybrid vehicle, from 47 miles per gallon in combined city and highway driving to 43 mpg.
PAT NASON, United Press International
Page 2 of 5
Fuel Efficiency
President Barack Obama (C) delivers remarks alongside Environmental Protection Agency (EPA) Administrator Lisa Jackson (R) and Transportation Secretary Ray LaHood prior to signing a series of executive orders during a ceremony in the East Room at the White House in Washington on January 26, 2009. The executive orders will give states more control over car emissions and increase vehicle fuel efficiency standards. (UPI Photo/Kevin Dietsch)

Fuel efficiency, is a form of thermal efficiency, meaning the efficiency of a process that converts chemical potential energy contained in a carrier fuel into kinetic energy or work. Overall fuel efficiency may vary per device, which in turn may vary per application, and this spectrum of variance is often illustrated as a continuous energy profile. Non-transportation applications, such as industry, benefit from increased fuel efficiency, especially fossil fuel power plants or industries dealing with combustion, such as ammonia production during the Haber process. The United States Department of Energy and the EPA maintain a Web site with fuel economy information, including testing results and frequently asked questions.

In the context of transportation, "fuel efficiency" more commonly refers to the energy efficiency of a particular vehicle model, where its total output (range, or "mileage" ) is given as a ratio of range units per a unit amount of input fuel (gasoline, diesel, etc.). This ratio is given in common measures such as "liters per 100 kilometers" (L/100 km) (common in Europe and Canada) or "litres per mil" (Norway/Sweden) or "miles per gallon" (mpg) (prevalent in the USA, UK, and often in Canada, using their respective gallon measurements) or "kilometres per litre"(kmpl) (prevalent in Asian countries such as India and Japan). Though the typical output measure is vehicle range, for certain applications output can also be measured in terms of weight per range units (freight) or individual passenger-range (vehicle range / passenger capacity).

This ratio is based on a car's total properties, including its engine properties, its body drag, weight, and rolling resistance, and as such may vary substantially from the profile of the engine alone. While the thermal efficiency of petroleum engines has improved in recent decades, this does not necessarily translate into fuel economy of cars, as people in developed countries tend to buy bigger and heavier cars (i.e. SUVs will get less range per unit fuel than an economy car).

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Fuel Efficiency."
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