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[[File:1975-_US_vehicle_production_share,_by_vehicle_type.svg|1975- US vehicle production share, by vehicle type|thumb]] '''Fuel efficiency''' refers to the ability of a [[vehicle]] or machine to extract energy from [[fuel]] to power its movements or operations. It is a measure of how effectively fuel, such as [[gasoline]], [[diesel]], or [[electricity]], is converted into usable energy for propulsion. Fuel efficiency is often expressed in terms of [[miles per gallon]] (mpg) in the United States or [[liters per 100 kilometers]] (L/100 km) in countries using the metric system. Improving fuel efficiency has become a critical goal for [[automobile manufacturers]], [[government agencies]], and environmental organizations due to its impact on [[energy conservation]], [[economic savings]], and [[environmental protection]].

==Factors Affecting Fuel Efficiency==
Several factors can influence the fuel efficiency of a vehicle, including its design, weight, engine size, and aerodynamics. Additionally, driving habits such as speed, acceleration, and the use of air conditioning can significantly affect a vehicle's fuel consumption.

===Engine Efficiency===
The [[engine]] is the heart of any vehicle, and its efficiency plays a crucial role in fuel consumption. Advances in technology, such as [[turbocharging]], [[direct fuel injection]], and [[variable valve timing]], have significantly improved engine efficiency. [[Hybrid vehicles]], which combine an internal combustion engine with an electric motor, can offer even greater fuel efficiency by utilizing regenerative braking and electric-only drive modes.

===Aerodynamics===
A vehicle's shape and surface can impact air resistance, or [[drag]], which in turn affects fuel efficiency. Manufacturers design vehicles with aerodynamic shapes to reduce drag, allowing them to move more efficiently through the air. Features such as smooth underbodies, grille shutters, and rear spoilers can also improve a vehicle's aerodynamics.

===Weight Reduction===
The weight of a vehicle directly influences its fuel efficiency. Lighter vehicles require less energy to accelerate and maintain speed. Manufacturers use materials such as aluminum, high-strength steel, and carbon fiber to reduce vehicle weight without compromising safety.

===Tire Efficiency===
[[Tires]] also play a significant role in fuel efficiency. Low rolling resistance tires are designed to minimize the energy lost as heat when a tire rolls down the road. Proper tire maintenance, including regular inflation checks, can also improve fuel efficiency.

==Environmental Impact==
Improving fuel efficiency is crucial for reducing [[greenhouse gas emissions]] and combating [[climate change]]. Vehicles with higher fuel efficiency consume less fuel per mile traveled, leading to lower emissions of carbon dioxide (CO2) and other pollutants. Governments around the world have implemented regulations and standards to promote higher fuel efficiency in vehicles, such as the [[Corporate Average Fuel Economy]] (CAFE) standards in the United States.

==Future Trends==
The future of fuel efficiency lies in the development of alternative fuels and advanced vehicle technologies. [[Electric vehicles]] (EVs) and [[plug-in hybrid electric vehicles]] (PHEVs) are gaining popularity as they offer the potential for significant reductions in fuel consumption and emissions. Advances in battery technology and the expansion of charging infrastructure are key to the widespread adoption of these vehicles. Additionally, the exploration of [[hydrogen fuel cells]] as a clean energy source for vehicles could further improve fuel efficiency and reduce environmental impact.

[[Category:Automotive technologies]]
[[Category:Energy conservation]]
[[Category:Environmental technology]]

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