Rajan Wilcox
Cars have traditionally been fuelled by gasoline or diesel, but in recent years, alternative fuel vehicles (AFVs) have become increasingly popular. These vehicles are powered by alternative fuels such as electricity, hydrogen, ethanol, and biofuels, rather than traditional gasoline or diesel. The rise of AFVs can be attributed to growing concerns about the environmental impact of fossil fuels and advancements in technology that have made alternative fuels more viable. As of December 2015, several electric cars have been made available for retail sales, including the Tesla Roadster, Nissan Leaf, and BMW i3. Hydrogen fuel cell vehicles, such as the Honda Accord Plug-in Hybrid and the Toyota Prius, are also gaining traction as they produce less pollution than traditional gas-powered cars. Additionally, Brazil has led the way in the adoption of ethanol-powered automobiles, with over 38.3 million flex-fuel vehicles in the country as of 2021.
| Characteristics | Values |
|---|---|
| Fuel Type | Gasoline, Diesel, Ethanol, Hydrogen, Electricity |
| Fuel Combinations | Gasoline and Ethanol, Gasoline and Diesel |
| Fuel Storage | Fuel Tank |
| Engine Type | Internal Combustion Engine, Electric Motor |
| Fuel Efficiency | Affected by vehicle shape, tyre design and materials, and driving conditions |
| Fuel Loss | Engine and driveline inefficiencies, powering accessories, heat, engine friction, pumping air, combustion inefficiency |
| Alternative Fuel Vehicles | Hydrogen Fuel Cell Vehicles, Plug-in Hybrids, Electric Vehicles |
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Electric cars
There are also plug-in hybrid vehicles that can act like EVs but also operate like gas-electric hybrids when the battery charge is depleted. As of December 2015, several electric vehicles were available for retail sales, including the Tesla Roadster, Nissan Leaf, BMW ActiveE, and Renault Twizy.
The future of electric vehicles in the United States is uncertain due to rising tensions with China, which controls about 90% of the global rare earth market—essential for building EV motors and batteries. Former President Donald Trump's tariffs and the subsequent trade war have put the industry in a difficult position, with key components and supply chains caught in the crossfire. However, the conviction that the future is electric persists, and companies like Subaru, Kia, Lucid, and Hyundai are introducing new electric models.
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Hydrogen fuel cell cars
HFCVs are refuelled at "hydrogen fuelling stations" in a process similar to refuelling at a traditional gas station, with a similar five-minute refuelling time. Hydrogen is the most common element in the universe, but it is never found in its pure state and is always combined with other elements. Creating pure hydrogen for vehicles requires a lot of energy to "crack" compounds like natural gas (CH4) into pure H2, with CO2 as a byproduct. While most hydrogen today is derived from fossil fuels, it can also be produced through the electrolysis of water using renewable electricity.
The Toyota Mirai, the best-selling hydrogen car in the U.S., has a fuel cell rated at 90 kW (120 horsepower). However, this power output is not sufficient for acceleration onto a fast-moving highway, so Toyota adds a high-voltage, low-capacity battery similar to those in gasoline-electric hybrid vehicles. This battery provides supplemental power for short periods of intense acceleration and is recharged through regenerative braking or excess fuel-cell output when the car is cruising.
As of mid-2022, there were 17,000 or fewer hydrogen-powered vehicles on U.S. roads, all in California, the only state with a network of retail hydrogen fuelling stations. Three hydrogen-powered cars have been offered for sale: the Honda Clarity Fuel Cell, the Hyundai Nexo SUV, and the Toyota Mirai. However, Honda has ended production of the Clarity, and Hyundai has sold only about 1,600 Nexo SUVs in six years.
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Gasoline cars
Gasoline-powered vehicles have been widely used for many years and continue to be a common choice for car owners. However, there are alternatives to gasoline cars, such as electric vehicles (EVs) and hybrid vehicles, which are becoming increasingly popular due to their environmental and cost-saving benefits. Electric vehicles, for example, have lower fuel costs and produce less carbon pollution and other harmful emissions.
It is worth noting that most modern cars designed to run on gasoline are also capable of running with a blend of gasoline and ethanol. Ethanol is considered a renewable resource, as it can be obtained from sugar or starch in crops, such as grain, sugarcane, and sugar beets. This blend can include up to 15% ethanol (E15) and is compatible with most gasoline cars.
In some countries, like Brazil, there has been a push towards ethanol-powered vehicles. Brazil's Pro-alcool program in 1975 promoted the use of ethanol fuel and ethanol-powered automobiles. These vehicles were popular in the 1980s but became less economically feasible when oil prices dropped and sugar prices rose. However, the adoption of flex-fuel technology, which allows vehicles to run on various blends of gasoline and ethanol, has been successful in Brazil and other countries like the United States.
Overall, gasoline cars have a well-established infrastructure and continue to be a significant segment of the automotive market. However, the rise of alternative fuel vehicles, such as electric cars and flex-fuel vehicles, offers consumers more choices and potentially more environmentally friendly options.
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Ethanol-powered cars
In 1975, Brazil launched the Pro-alcool program, a government-subsidized effort to manufacture ethanol fuel from sugarcane and ethanol-powered automobiles. These ethanol-only vehicles were popular in the 1980s but became impractical when oil prices fell and sugar prices rose. In 2003, Volkswagen built the first commercial ethanol flexible-fuel car, the Gol 1.6 Total Flex, which was a commercial success. By early 2009, nine other Brazilian manufacturers were producing flexible-fuel vehicles, and they quickly became popular, with 87.6% of new car sales in July 2008 being flexible-fuel vehicles.
The United States is the second-largest market for flexible-fuel vehicles after Brazil, with more than 21 million 85 flex-fuel vehicles registered by the end of 2017. U.S. flex-fuel vehicles are optimized to run on a maximum blend of 15% gasoline with 85% anhydrous ethanol (called E85 fuel). This limit on ethanol content is set to reduce emissions at low temperatures and avoid cold-starting problems during cold weather. While the number of flex-fuel vehicles in the U.S. is growing, the actual use of ethanol fuel is limited due to the lack of E85 refueling infrastructure and low consumer awareness.
In August 2023, Toyota unveiled the world's first 100% ethanol-powered car, a variant of the Innova. Ethanol is considered promising for India as it is indigenous, eco-friendly, and renewable.
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Hybrid cars
The Honda Civic, for example, offers a range of engines that provide either high fuel efficiency or sporty performance, while the Toyota Camry's hybrid lineup boasts a roomy and comfortable cabin, advanced technology features, and a stylish design. The Prius, another well-known hybrid, has improved in power and style, but falls short in terms of rear passenger and cargo space. For those seeking a hybrid SUV, the Grand Highlander Hybrid offers two versions: the standard Hybrid for maximum fuel efficiency and the Hybrid Max for those wanting more power. The Hyundai Tucson Hybrid is another small SUV option that delivers good fuel economy, a comfortable ride, and an array of standard technology features.
When it comes to luxury hybrids, vehicles like the Lexus ES 300h and the Mercedes-Benz sedans offer high fuel efficiency, luxurious accommodations, and impressive performance. However, these luxury models often come with a higher price tag and may prioritize passenger space over cargo area. Plug-in hybrid electric vehicles (PHEVs) are also worth considering, as they feature a large battery pack that can be recharged by plugging it in, providing an all-electric range and the option to operate as a normal hybrid. The Prius Prime, for instance, stands out for its substantial all-electric range, high fuel economy, and pleasing driving characteristics.
As the market for hybrid vehicles continues to expand, consumers are presented with a diverse range of options to suit their specific needs and preferences. Whether prioritizing fuel efficiency, performance, comfort, or style, hybrid cars offer a combination of drivability and outstanding fuel economy, making them an attractive choice for many drivers.
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Frequently asked questions
The most common fuels for cars are gasoline and diesel.
Alternative fuels for cars include ethanol, hydrogen, electricity, and biofuels.
Alternative fuels for cars can reduce pollution and greenhouse gas emissions compared to traditional gasoline or diesel-powered vehicles. They can also improve fuel efficiency and reduce a country's dependence on imported fossil fuels.
