Ameer Randolph
The most common energy source for cars is gasoline, with nearly 100 registered gasoline-powered vehicles for every electric vehicle in the US. However, the growth rate for alternative-powered vehicles is higher than that of gasoline-powered vehicles. Electric vehicles, for example, are becoming more popular due to their lower environmental impact and greater sustainability. Other alternative fuel sources include biodiesel, ethanol, propane, natural gas, and hydrogen.
| Characteristics | Values |
|---|---|
| Most common energy source for cars | Gasoline |
| Alternative energy sources | Electricity, biodiesel, ethanol, propane, natural gas, hydrogen, lithium-ion batteries |
| Fuel efficiency | 12-30% of energy from fuel is used to move the car |
| Energy loss | Engine and driveline inefficiencies, powering accessories |
| Advanced technologies | Variable valve timing and lift (VVT&L), turbocharging, direct fuel injection, cylinder deactivation |
| Fuel efficiency improvements | New tire designs and materials, integrated starter/generator (ISG) systems |
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What You'll Learn
Electric vehicles are more fuel-efficient than gas-powered cars
Electric vehicles (EVs) are more fuel-efficient than gas-powered cars. While an average gas-powered car can reach up to 482 kilometres (300 miles) on a full tank, most electric models have a range of 200–490 kilometres (124–304 miles) on a single charge. Newer EV models, such as the Hyundai Kona Electric, Chevrolet Bolt EV, and Kia e-Niro, offer similar ranges to an average fuel car.
EVs operate with only about 11% energy loss, meaning that most of the energy that goes into the car ends up turning the wheels. In comparison, a conventional vehicle only uses about 12%–30% of the energy from the fuel to move it forward. The rest is lost to engine and driveline inefficiencies or used to power accessories. In gasoline-powered vehicles, most of the fuel's energy is lost as heat in the engine, with smaller amounts lost through engine friction, pumping air into and out of the engine, and combustion inefficiency.
EVs can also recapture energy during braking, boosting overall efficiency. Additionally, they accelerate faster than gas-powered cars due to their simpler electric motors, which can provide full torque from a standstill, resulting in instant acceleration.
In terms of emissions, EVs are also more efficient. Gasoline cars emit more than 350 grams of CO2 per mile driven over their lifetimes, while fully battery-electric vehicles emit just 200 grams. According to the US Department of Energy, EVs create 3,932 lbs of CO2 equivalent per year, compared to 5,772 lbs for plug-in hybrids and 6,258 lbs for gasoline cars.
However, it is important to consider the energy source used to charge EVs. In states like West Virginia, where over 90% of electricity comes from inefficient coal, an EV charged in this state would still reduce carbon pollution by 30% compared to a gasoline car. Additionally, the manufacturing process for EV batteries can be emissions-intensive, with the intensive battery manufacturing of a Tesla Model 3 creating between 2.5 and 16 metric tons of CO2.
Despite these considerations, the growth rate for alternative-powered vehicles is higher than that of gasoline-powered vehicles. From 2020 to 2022, the number of registered gasoline-powered vehicles in the US increased by 3.5% per 10,000 people, while the number of electric vehicles on the road grew by 135%.
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Gasoline engines waste energy through combustion
Gasoline is the most-used fuel in the US, but a combination of fuels is available across the nation. Electric vehicles are growing in popularity, but there are nearly 100 registered gasoline-powered vehicles for every electric vehicle (EV) in the US.
Gasoline-powered vehicles are inefficient, with only about 12%–30% of the energy from the fuel being used to move the car. The rest of the energy is lost to engine and driveline inefficiencies or used to power accessories. In gasoline-powered vehicles, most of the fuel's energy is lost in the engine, primarily as heat. Smaller amounts of energy are lost through engine friction, pumping air into and out of the engine, and combustion inefficiency.
Engine losses are higher in cities, where vehicles spend a significant amount of time idling in stop-and-go traffic, using energy to run the engine and power accessories like the water pump, power steering, and air conditioning. In contrast, highway driving includes little to no idling and higher speeds, so more energy is expended on moving air out of the way as the vehicle moves forward. This resistance is directly related to the vehicle's shape and frontal area, with smoother vehicle shapes reducing drag significantly.
Advanced technologies such as variable valve timing and lift (VVT&L), turbocharging, direct fuel injection, and cylinder deactivation can be used to reduce engine losses. Diesel engines are inherently more efficient than their gasoline counterparts, but recent advances in diesel technologies and fuels are making diesels more attractive. Automakers are also improving fuel economy by exploiting a new controls approach that uses the waste heat from vehicle engines.
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Hydrogen is a highly accessible energy source for cars
Hydrogen fuel cells, which combine hydrogen and oxygen to produce electricity, have been used by NASA to power space missions and have the potential to power vehicles with zero emissions. Hydrogen fuel cells are two to three times more efficient than internal combustion engines running on gasoline, and they can also be used in conjunction with batteries in hybrid vehicles. Hydrogen-powered cars are already on the road in California, and the state is promoting the establishment of publicly accessible hydrogen vehicle fueling stations to support a consumer market for zero-emission fuel cell vehicles.
However, there are some challenges to adopting hydrogen as a fuel source for cars. Hydrogen has a low energy content by volume, which makes storing it a challenge. It requires high pressures, low temperatures, or chemical processes to be stored compactly, and this currently requires a larger tank than other gaseous fuels. Additionally, the high cost of fuel cells and the limited availability of hydrogen fueling stations have limited the number of hydrogen-fueled vehicles in use today.
Despite these challenges, hydrogen has the potential to be a significant energy source for cars in the future. Hydrogen can help strengthen national energy security, conserve petroleum, and provide a more diverse range of transportation energy options. With advancements in technology and infrastructure, hydrogen-powered vehicles could become more common and contribute to a more resilient and sustainable transportation system.
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Ethanol is a renewable, alcohol-based fuel
While gasoline is the most common energy source for cars, ethanol is also used as a fuel. Ethanol is a renewable, alcohol-based fuel made from various plant materials, including corn grain, sugar cane, wood chips, and crop residues. It has the chemical formula CH3CH2OH and is also known as ethyl alcohol, grain alcohol, or EtOH.
Ethanol is produced by converting plant materials, or biomass, into ethanol at a production facility. This process requires energy, but ethanol produced from corn has a positive energy balance, meaning the production process does not require more energy than the amount of energy contained in the fuel itself. Cellulosic ethanol, made from trees and grasses, further reduces the amount of fossil fuel energy used in production and results in lower levels of life cycle greenhouse gas emissions.
Ethanol is typically blended with gasoline to create motor gasoline with 10% ethanol content, known as E10. This blend is used in most gasoline-powered vehicles in the United States and helps to oxygenate the fuel and reduce air pollution. Higher blends of ethanol, such as E85, are also available for flexible-fuel vehicles designed to operate on any blend of gasoline and ethanol.
Ethanol has a higher octane number than gasoline, providing premium blending properties and helping to prevent engine knocking. However, ethanol contains less energy per gallon than gasoline, and the use of ethanol as a fuel has been debated due to concerns about increased food prices and the environmental impact of ethanol production.
Despite these concerns, some countries, like Brazil and India, have mandated or set targets for the blending of ethanol with gasoline. Ethanol is also being explored as a solution to fuel shortages and environmental damage in developing countries, where it could provide a cleaner alternative to traditional cooking methods.
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Propane is a clean-burning, affordable fuel alternative
Gasoline is the most common energy source for cars. However, there are around 33 million vehicles in the US that rely on alternative fuels. This includes electric vehicles, as well as those powered by biodiesel, ethanol, propane, natural gas, or hydrogen.
The transition from petroleum to propane usually involves converting a vehicle's original gasoline or diesel engine to run solely on propane autogas or on propane and gasoline. Propane has a higher octane rating than premium-grade gasoline, allowing for a higher compression ratio in the engine and greater efficiency.
Propane is a viable alternative fuel option, as evidenced by its use in the Dominican Republic, where most cars have been converted to LP, which is cheaper than gasoline. However, the challenge lies with existing propane marketers, who are mostly unwilling to adopt propane for their vehicles.
Despite the benefits of propane as a clean-burning and affordable fuel, it has not gained prominence in the alternative fuels conversation. Policy incentives and support for propane refueling stations could help increase its adoption.
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Frequently asked questions
Yes, fuel is the most common energy source for cars. Gasoline and diesel are the most common types of fuel used in cars. However, with growing concerns about the automotive industry's impact on the environment, alternative energy sources such as electricity, biodiesel, ethanol, propane, natural gas, and hydrogen are becoming more popular.
Some alternative energy sources for cars include electricity, biodiesel, ethanol, propane, natural gas, and hydrogen. Electric vehicles, for example, are powered by rechargeable batteries and produce fewer emissions than gasoline or diesel-powered vehicles.
In fuel cars, energy from the fuel is transformed into chemical energy, which is then delivered to the wheels. Most fuel cars have an internal combustion engine that relies on the hydrocarbon combustion of fossil fuels to provide power.
Alternative energy sources for cars are becoming more popular due to growing concerns about the environmental impact of the automotive industry. These alternative energy sources offer greater sustainability and reduced emissions. Additionally, advancements in technology have made it possible to improve the fuel efficiency of vehicles, further reducing their environmental impact.
