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EPA plans to revise fuel-efficiency tests

WASHINGTON, Jan. 10 (UPI) -- The U.S. Environmental Protection Agency plans to announce new testing standards for vehicle fuel efficiency this week, the Detroit Free Press said Tuesday.

Fuel efficiency rule change to help GM

WASHINGTON, July 29 (UPI) -- The White House appears to be tweaking fuel-efficiency standards on behalf of domestic automakers and at the expense of Toyota Motor Corp.

Poll: Fuel-efficient vehicles 'patriotic'

PRINCETON, N.J., March 17 (UPI) -- Two out of three Americans see buying more fuel-efficient vehicles as a "patriotic" move, a poll by Opinion Research of New Jersey shows.

AAA wants believable fuel economy ratings

HEATHROW, Fla., March 3 (UPI) -- AAA is supporting a bill to force U.S. regulators to update fuel-economy measurements of vehicles, which often fail to meet stated mileage ratings.

Study: vehicle efficiency key to clean air

DURHAM, N.C., Oct. 26 (UPI) -- U.S. ecologists say doubling vehicle efficiency would cut twice as much carbon dioxide emissions as retiring croplands and going to no-till farming.

Benefit of fuel economy increase limited

WASHINGTON, Jan. 5 (UPI) -- The Congressional Budget Office said Monday that an increase in fuel economy standards for automobiles would raise vehicle prices $228 and reduce gas consumptio

Ethanol cars may dodge fuel standards

DETROIT, Aug. 2 (UPI) -- Automakers are mounting an effort to build ethanol-powered vehicles that environmentalists charge is a way of dodging fuel-efficiency standards.

Hybrid vehicles lead fuel economy list

WASHINGTON, Oct. 29 (UPI) -- Three car models running on combination gas/electric power plants are tops in fuel efficiency for the 2003 model year, with diesel-powered cars taking most of the other top 10 spots, government officials said Tuesday. Ongoing research will avoid simply sh

Senate accepts weaker fuel efficiency

WASHINGTON, March 13 (UPI) --

Honda Insight most fuel-efficient

WASHINGTON, Oct. 9 (UPI) -- At an average 61 miles per gallon, the gas-electric Honda Insight gained the top spot Tuesday in the Environmental Protection Agency's and the Department of Ene
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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)
Wiki

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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