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Units of measure

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Wikipedia About Fuel Economy

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Units of measure

The two most common ways to measure automobile fuel economy are:

  1. The amount of fuel used per unit distance; most commonly, litres per 100 kilometres (l/100 km). Lower values mean better fuel economy: you use less fuel to travel the same distance.
  2. The distance travelled per unit of fuel used; most commonly kilometres per litre (km/l) or miles per gallon (mpg), which may be U.S. gallon or imperial gallon, although the imperial gallon is about 20% larger than the U.S. gallon. Higher values mean better fuel economy: you can travel farther for the same amount of fuel.

To convert between l/100 km and miles per U.S. gallon, divide 235 by the number in question. For miles per imperial gallon, use 282 instead of 235. For example, to convert from 30 mpg (U.S.) to l/100 km, divide 235 by 30, giving 7.83 l/100 km; or from 10 l/100 km to mpg U.S., divide 235 by 10 (23.5 mpg). To convert from l/100 km to km/l, divide between 100 and calculate the reciprocal of the result.

A related measure is the amount of carbon dioxide produced as a result of the combustion process, typically measured in grams of CO2 per kilometre (CO2 g/km). A petrol (gasoline) engine will produce around 2.32 kg of carbon dioxide for each litre of petrol consumed (19.4 lb/gal). A typical diesel engine produces 2.66 kg/l (22.23 lb/gal) though typically burns fewer litres per kilometre (and is thus typically more fuel efficient for an otherwise identical car). Since the CO2 emissions are relatively constant per litre, fuel efficiency is directly related to emissions of CO2 per kilometre.

Inverse scale

A modest improvement in fuel economy for a relatively inefficient vehicle can provide greater savings in terms of financial cost to the driver and environmental impact than a proportionately larger increase for a more economical vehicle. This is most intuitively demonstrated using the inverse scale - gallons per mile or liters per kilometer. If a driver who travels 15,000 miles a year switches from a vehicle with 10 mpg to 12 mpg average fuel economy (0.10 gallons per mile to 0.083 gallons per mile), 250 gallons are saved. A similar 20% improvement in exchanging a 30 mpg for a 36 mpg (0.033 gallons per mile for 0.27) vehicle saves only 83 gallons for similar driving patterns.

Fuel economy statistics

The choice of car and how it is driven drastically affects the fuel economy. A top fuel dragster can consume 6 U.S. gallons (23 L) of nitromethane for a quarter-mile (400 m) run in about 4.5 seconds, which comes out to 24 U.S. gallons per mile (5600 L per 100 km). The other extreme was set by a French entrant in the Eco-Marathon in 2004, who managed 3410 km/l, or more than 8000 mpg-U.S. .

Search results for Fuel Economy

Fuel Economy Center - Edmunds.com

Edmunds' Fuel Economy Center has tips on choosing a fuel-efficient car and information on alternative fuels, hybrids, and improving gas mileage.www.edmunds.com/fueleconomy

Corporate Average Fuel Economy - Wikipedia, the free encyclopedia

The Corporate Average Fuel Economy (CAFE) regulations in the United States, ... 1 Effect on automotive fuel economy. 2 Calculation. 3 Historical standards ...en.wikipedia.org/wiki/Corporate_Average_Fuel_Economy

Fuel Economy | US EPA

On this page, you will find fuel economy information for consumers, details ... IMPORTANT REMINDER: EPA's fuel economy estimates are designed to allow consumers ...epa.gov/fueleconomy/index.htm

Fuel economy in automobiles: Information from Answers.com

Related blogs on: fuel economy Daily Fuel Economy Tip Gas saving tips Add your blog to the Answers Directory ... 4.1 Fuel economy-boosting technologies. 4.1.1 ...www.answers.com/topic/fuel-economy-in-automobiles

Chevrolet | Chevy Fuel Economy, Fuel Efficiency, Highway MPG

Check out the city and highway MPG estimates for Chevy's fuel efficient vehicles, including 7 models with 30 MPG highway or better.www.chevrolet.com/fueleconomy/

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News about Fuel Economy

Oil falls towards $58 on economy fears

Boston GlobeOil fell toward $58 a barrel on Monday, reversing some of the previous session's near 3 percent gains, as investors took profit amid warnings that any global recovery will only be gradual.http://www.boston.com/news/world/australia/articles/2009/05/...

Market Snapshot: U.S. stocks seek further fuel for rally

Market WatchEconomic updates on retail sales as well as quarterly results from the nation's retailers are expected to be the highlights next week for a market in need of fuel to continue a two-month rally.http://www.marketwatch.com/enf/rss.asp?guid=%7B5DB693D4-3033...

Audi reveals new technologies to improve fuel economy

Auto SpiesIt was announced by Audi today that it is planning to launch a number of its latest technologies targeted toward the improvement of vehicle efficiency.http://www.autospies.com/news/Audi-reveals-new-technologies-...

Scientific research has impact on economy

The Norman TranscriptIn an economic recession, it's important not to become so short-sighted that you halt investments in long-term research, local researchers say.While research results can often benefit society through scientific advances, research also has a more direct benefit on the economy that should not be overlooked, said Dr.http://www.normantranscript.com/localnews/local_story_130012...

Fuel tax hike may hurt economy

The Nation - Thailand's English newsThe government's move to raise excise taxes on fuel products may not lead to lower consumption, but could have a negative impact on the economy, said Manoon Siriwan, an oil industry analyst.http://www.nationmultimedia.com/2009/05/07/business/business...

News about Fuel Economy

This economy tastes like bacon

Seattle TimesThis economy tastes like bacon The swine-flu pandemic scare and the global economic flu share a common bond, writes columnist ... to break up financial firms, preferring instead another bank bailout — even as analysts warn that such bailouts fuel ... http://seattletimes.nwsource.com/html/opinion/2009203966_opi...

In shrine state, water & firewood top poll demands

Hindustan Times ... are in the Indian armed forces and many others went out of the state for work, making the state dependent on ‘money-order economy’. Historically, women have been responsible for running the household and taking decisions, which is why water, fuel ... http://www.hindustantimes.com/Redir.aspx?ID=786f4a6d-48ed-47...

Indian economy to grow 6.1-6.5 pct in FY10 - CII

Reuters IndiaNEW DELHI (Reuters) - India's economy is likely to grow between 6.1 and 6.5 percent in the fiscal 2009/10, on a decline in interest rates, moderation in food and fuel prices and lower indirect tax rates, an industry lobby said. Asia's third largest ... http://in.reuters.com/article/businessNews/idINIndia-3939702...

As GM, Chrysler Stumble, Ford Gains With Fusion

TimeFord's midsize Fusion model is a viable competitor against Toyota's popular Camry, with the 2010 models getting praise for quality, safety and fuel economy. More than 40 percent of the 2010 Fusions sold are hybrids that get 41 miles per gallon. ... http://www.time.com/time/business/article/0,8599,1895529,00....

World's most daunting parking job

BBC NewsGood economy will pay dividends later in the mission when fuel is needed to make the regular small tweaks in the telescopes' parking slots. "L2 is unstable and we'll need to use our thrusters once a month," says Mr Watson. "It's like trying to ... http://news.bbc.co.uk/1/hi/sci/tech/8040073.stm

Search results for Fuel Economy

Fuel Economy - Jalopnik

Contribute To The Environment Unconsciously With The Magic Power System! What would you say to a £34.99 ($53.75) device that plugs into your car's lighter socket and gives you 10 ... http://jalopnik.com/tag/fuel-economy/?refId=18

Fuel Economy - Consumerist

fuel economy Obama Auto Task Force Team's Cars Fail CAFE Standards After it was pointed out that most of the cars owned by members of President Obama's Task Force on the Auto ... http://consumerist.com/tag/fuel-economy/

Fuel Economy Facts

Fuel Economy Facts for saving fuel in your car or truck.http://fueleconomyfacts.com

Fuel Economy

Close up on a man's face as he stands near a gas pump. "With gas prices goin' through the roof like this, I can't afford to drive to work anymore." He falters and seems close to ... http://www.edmunds.com/advice/fueleconomy/articles/131348/ar...

TVFE - Ricardo's Total Vehicle Fuel Economy

Ricardo Consortia Win UK Government Funding for Three Major Low-Carbon Vehicle-Development ... Ricardo’s Total Vehicle Fuel Economy process is a systems approach that quickly ... http://www.totalvehiclefueleconomy.com/
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Answers for Fuel Economy

Jerry CCan I get better fuel economy on a diesel by installing a less restrictive air intake and larger exhaust?Jerry CA turbo-back exhaust will help with economy some. It will also lower exhaust temperatures (something important to watch on a modified diesel, even a stock diesel in my opinion). The intake will help s...johnCan cleaning the fuel injectors cause lower fuel economy?johnAbsolutely not (if they did it properly). How much did you pay and what kind of fuel service did they perform. Sounds like they put one of those bottles from autozone instant results for ten dollars, ...AdamWhat kind of fuel economy is achieved by small private airplanes?AdamSmall aircraft use a lot more fuel than cars. A tiny private airplane configured to fly as economically as possible still will not get better than around 15 mpg, and other aircraft and other configura...Mr. QWhat year was the average fuel economy for American vehicles the highest?Mr. QIn the past 30 years, the EPA has forced the fuel companies to change their fuel to meet pollution standards. Each time it changes fuel economy goes down. In 2005 the Hyundai Accent had a 35-37m...cameronandlaceyHow to improve fuel economy on a hybrid car?cameronandlaceyHi, there is very little you will want to modify on a Civic Hybrid, Honda does have this down to a science. In over four years of researching and presenting hybrid information, I have yet to see...
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