
The automobile industry has been transitioning from internal combustion engine vehicles (ICEVs) to new-generation vehicles (NGVs) to address resource-related issues. The most commonly used fuel for transportation is gasoline, which is a petroleum product made from crude oil and natural gas processing. Petroleum fuels power 98% of vehicles in the United States, with the country importing two-thirds of its petroleum. However, alternative fuels such as electricity, biodiesel, methanol, ethanol, and natural gas are becoming more popular to improve efficiency, reduce costs, and cut emissions.
| Characteristics | Values |
|---|---|
| Natural resources required | Petroleum products (crude oil, natural gas), electricity, biofuels, vegetable oils, animal fats, recycled cooking grease, ethanol, methanol, hydrogen |
| Fuel type | Gasoline, diesel, jet fuel, residual fuel oil, propane, biodiesel, electricity, ethanol |
| Vehicle type | Internal combustion engine vehicles (ICEVs), new-generation vehicles (NGVs), electric vehicles (EVs), hybrid electric vehicles (HEVs), fuel cell vehicles (FCVs) |
| Energy sources | Energy conversion unit (combustion engine, fuel cell), energy storage device (battery, flywheel, ultracapacitor) |
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What You'll Learn

Petroleum products, including gasoline, diesel and jet fuel
Petroleum products are fuels made from crude oil and the hydrocarbons found in natural gas. They can also be made from coal, natural gas, and biomass. Crude oil is extracted from the earth and sent to refineries, where it is separated into usable petroleum products. A 42-gallon barrel of crude oil yields approximately 45 gallons of petroleum products.
Petroleum products include gasoline, diesel, and jet fuel. Gasoline, or petrol, is the dominant transportation fuel in the United States and is used in cars, motorcycles, light trucks, and boats. Aviation gasoline is used in airplanes. In 2022, motor gasoline consumption, excluding fuel ethanol, accounted for 52% of total energy consumption by the U.S. transportation sector.
Diesel fuel, the second-most-consumed petroleum product in the United States, is used in diesel engines found in heavy construction equipment, trucks, buses, tractors, boats, trains, some automobiles, and electricity generators. Heating oil, also known as fuel oil, is used for heating homes and buildings and for producing electricity in power plants.
Jet fuel is the fourth-most-used petroleum product in the United States. It is used in jet airplanes and some types of helicopters. In 2022, jet fuel consumption in the U.S. averaged about 1.56 million barrels per day, accounting for 8% of total petroleum consumption.
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Natural gas
The use of natural gas as a vehicle fuel is not a new concept. As early as 1894, natural gas was employed to power railway transport in Dessau, Germany. However, widespread adoption of NGVs was hindered in the late 1940s and early 1950s due to limited gas supply and production. Today, almost all major car manufacturers, including Volvo, Audi, Chevrolet, and Toyota, offer vehicles with engines running on CNG. These cars are comparable in performance to conventional gasoline cars, providing similar horsepower, acceleration, and cruise speed.
Furthermore, natural gas can be used in a variety of vehicles, from freight-hauling trucks and buses to smaller applications such as forklifts and commercial lawn equipment. It is also suitable for public transport, as demonstrated by the example of converting 100 buses from conventional fuel to methane, resulting in significant cost savings. The use of renewable natural gas (RNG) further enhances the environmental benefits, with RNG being considered carbon-neutral or even carbon-negative when derived from waste sources, leading to a substantial reduction in greenhouse gas emissions.
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Electricity
The use of electricity as a power source for vehicles is becoming increasingly common, with electric vehicles (EVs) offering a range of benefits over traditional internal combustion engine (ICE) cars. EVs are powered by electricity stored in on-board battery packs, which can be charged at home or at public charging stations. This electricity is produced from various sources, including natural gas, coal, nuclear energy, and renewable sources like wind and solar.
While EVs have zero tailpipe emissions, it is important to consider the emissions associated with generating the electricity used to charge them. The amount of carbon pollution created depends on the power source used to generate the electricity. For example, coal and natural gas emit carbon pollution, while wind and solar energy do not. However, research shows that even when accounting for these electricity emissions, EVs are generally responsible for lower levels of greenhouse gases (GHGs) than gasoline-powered cars.
The fuel economy of electric vehicles is also favourable compared to traditional cars. Electric vehicles can achieve higher miles per gallon of gasoline equivalent (MPGe) and have lower fuel costs. The range of EVs is also improving, with most models offering over 200 miles on a single charge. Additionally, regenerative braking in EVs helps to recharge the battery, further improving their fuel efficiency.
The adoption of EVs is expected to impact the demand for certain natural resources. For example, McKinsey estimates that by 2030, EVs could account for almost 20% of annual global car sales, significantly affecting the demand for natural gas and other raw materials used in EV batteries and power trains. However, it is important to note that the increased demand for EVs may only modestly reduce oil demand over the next 10 to 15 years.
In conclusion, the use of electricity as a power source for vehicles offers several advantages, including reduced emissions, improved fuel economy, and a lower environmental impact. As technology improves and charging infrastructure expands, we can expect to see a continued increase in EV adoption, which will have implications for various natural resources and the energy sector.
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Biodiesel
However, there are also some potential drawbacks to using biodiesel. It may not be suitable for older diesel engines, as it can degrade natural rubber gaskets and hoses in vehicles manufactured before 1992. Biodiesel may also cause deposits to form on injectors, leading to symptoms such as misfiring or hard starting. Additionally, concerns about biodiesel production include land use changes, deforestation, and the impact on food prices and availability.
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Ethanol
In the United States, nearly all motor gasoline now contains about 10% ethanol by volume, known as E10. This blend reduces air pollution and can be used by all models of vehicles sold in the country. Higher blends of ethanol, such as E15 (10.5% to 15% ethanol) and E85 (51% to 83% ethanol), are also available but are generally limited to flexible-fuel vehicles. These vehicles can run on any mixture of ethanol and gasoline up to E85.
The use of pure ethanol in internal combustion engines (ICEs) requires engine modifications. However, blends of ethanol and gasoline, such as E85, can take advantage of ethanol's high octane rating, which is compatible with very high compression ratios. The first production car running entirely on ethanol was the Fiat 147, introduced in Brazil in 1978.
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Frequently asked questions
Petroleum, which is made from crude oil and natural gas, is the most common fuel used for cars.
Alternative fuels include electricity, biodiesel, ethanol, methanol, compressed natural gas, and hydrogen.
Using alternative fuels can help improve efficiency, cut costs, and reduce emissions. For example, the United States uses about 13 million barrels of oil per day, and alternative fuels can reduce their dependence on imported petroleum.
Examples of alternative fuel vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), and fuel cell vehicles (FCVs).
HEVs are powered by two energy sources: an energy conversion unit (such as a combustion engine or fuel cell) and an energy storage device (such as a battery). The energy conversion unit can be powered by various alternative fuels, as mentioned earlier.











































