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| :''This article talks about fuel efficiency, which is closely related to ''[[fuel economy]]'', to learn about the difference, click [[fuel efficiency vs fuel economy|here]].''
| | <onlyinclude>The term '''fuel efficiency''' is sometimes used in everyday language to describe how far a vehicle will travel with a specific amount of fuel.</onlyinclude> Its important to note that this is a colloquial term which is used in place of '''[[fuel economy]].''' A ''true'' fuel [[efficiency]] should be expressed by a percent which measures how much of the [[fuel]] is used to [[power]] the movement of the car, vs the total amount of fuel that was injected.<ref>This is information obtained from speaking to John Heywood, Professor of Mechanical Engineering at MIT; Sun Jae Professor, Emeritus</ref> |
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| <onlyinclude>This article refers to the [[thermal efficiency]] of [[internal combustion engine|internal combustion]] car engines. This is how well a vehicle's engine is able to convert [[gasoline]] to distance traveled, as expressed in [[liters per hundred kilometers]], [[miles per gallon]], or [[kilometers per liter]]</onlyinclude>.
| | ==For Further Reading== |
| | | *[[Fuel economy]] |
| ==Factors in fuel efficiency== | | *[[Fuel consumption]] |
| Fuel efficiency is affected by a variety of factors. This includes the [[thermal efficiency]] of the [[heat engine|engine]], as well as mechanical losses from the [[drive train]], [[tire pressure]], [[brake]] efficiency, and coefficient of [[air drag|drag]] of the car. According to the US Department of energy, 5-15% of light-duty [[fuel]] consumption is a result of tires, and an improvement of up to 3% in fuel consumption is possible by properly inflating tires (this improves [[rolling resistance]])<ref>http://www.afdc.energy.gov/conserve/fuel_economy_tires_light.html</ref>.
| | *[[Fuel consumption vs fuel economy]] |
| | | *[[Fuel economy savings]] |
| ==How to improve fuel efficiency==
| | *[[Transportation]] |
| :''[[improving fuel efficiency|main article]]''
| | *Or explore a [[Special:Random|random page]] |
| It may not seem like it, but acceleration and speed during driving have a tremendous effect on fuel efficiency. Things like slowing down a little, not accelerating so rapidly substantially improve fuel efficiency. Also properly inflating tires to their proper [[pressure]] makes a big difference.
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| Car manufacturers can also improve fuel efficiency by implementing a variety of [[kinetic energy recovery system]]s, like [[regenerative braking]], and [[capacitor]]s to store electricity for rapid acceleration.
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| ==Savings based on fuel efficiency==
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| :''[[fuel efficiency savings|main article]]''
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| This is a table of fuel and [[carbon dioxide]] savings based on the fuel efficiency of the vehicle. Keep in mind that the make of the vehicle is not important here. [[Gasoline]] consumed is gasoline consumed, no matter what kind of car or truck you have.
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| {| class="wikitable"
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| ! MPG (US) !! Example !!km/L !! L/year !! kg CO<sub>2</sub> produced !! Savings from 24mpg ($1.20/L) !! 5 year savings !! 10 year savings
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| | 18 || Jeep Wrangler ||7.58 || 2234 || 5,343 || Costs an extra $668.40 || -$3342 || -$6,684
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| | 24 || Toyota Camry V6 ||10.1 || 1677 || 4,011 || 0 || 0 || 0
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| | 30 || Mini Cooper Clubman ||12.63 || 1341 || 3,207 || $403 || $2,015 || $4,030
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| | 38 || Fiesta 3-cyl ||16 || 1059 || 2,533 || $741 || $3705 || $7,410
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| | 45 || VW Golf TDI ||18.95 || 894 || 2,403* || $939.60 || $4,698 || $9,396
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| | 60 || Kia Rio 1.1 CDRi ||25.26 || 671 || 1,603 || $1,208.40 || $6,042 || $12,084
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| | 73.5 || VW Golf TDI Bluemotion <ref>http://green.autoblog.com/2013/06/26/new-vw-golf-tdi-bluemotion-is-most-fuel-efficient-ever-with-73/</ref> || 30.94 || 547.6 || 1,309 || $1,355.28 || $6,776.40 || $13,552.80
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| | 114** || Nissan Leaf || 48 || --- || 844 || $1,588 || $7,944 || $15,888
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| |}
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| <nowiki>*</nowiki>[[Diesel]] emits 2.7 kg CO<sub>2</sub> per liter<ref>http://www.eia.gov/tools/faqs/faq.cfm?id=307&t=11</ref>
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| <nowiki>**</nowiki>[[Miles per gallon gasoline equivalent|MPGe]]
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| ==Fuel efficiency conversions==
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| The metric system of discussing fuel efficiency is very different from the US system. In the metric systemm fuel efficiency is discussed as the number of litres that it takes to go 100 km, while in the US they concern themselves with the number of miles driven by 1 gallon of gas. The first is a measure of amount of gas divided by distance, while the second is distance divided by an amount of gas, completely opposite. The unit converter below can help explore this difference:
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| <html><br /> <iframe src="http://energyeducation.ca/simulations/converter/converter.php?defaultMeasure=Fuel Efficiency&defaultFrom=litre/100km&defaultTo=mile per gallon (US)" scrolling="no" width="750" height="200"> </iframe><br /> </html>
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| ==References== | | ==References== |
| {{reflist}} | | {{reflist}} |
| [[Category:Uploaded]]
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