Sylvie Willis
Flexible fuel vehicles (FFVs) are automobiles designed to run on multiple types of fuel. They are equipped with internal combustion engines that can operate on gasoline and any blend of gasoline and ethanol, with the most common blend being E85, which contains 51-83% ethanol. FFVs are designed to adjust their engine settings according to the blend of fuel, allowing for flexibility and convenience for drivers. These vehicles have gained popularity due to their potential environmental benefits, such as reduced toxic emissions, and are estimated to be in the millions worldwide.
| Characteristics | Values |
|---|---|
| Definition | Flex fuel, or flexible fuel, is an alternative fuel made of a combination of gasoline and methanol or ethanol. |
| Flex-fuel vehicles | Vehicles with internal combustion engines designed to run on more than one type of fuel. |
| Flex-fuel engines | Capable of burning any proportion of the resulting blend in the combustion chamber as fuel injection and spark timing are adjusted automatically according to the actual blend detected by a fuel composition sensor. |
| Flex-fuel vs bi-fuel vehicles | In flex-fuel vehicles, both fuels are stored in the same common tank, whereas in bi-fuel vehicles, two fuels are stored in separate tanks and the engine runs on one fuel at a time. |
| Common commercially available FFV | The ethanol flexible-fuel vehicle, with about 60 million automobiles, motorcycles and light-duty trucks manufactured and sold worldwide by March 2018. |
| Ethanol | Ethanol burns cleaner than gasoline, which means flex-fuel cars pump fewer toxic fumes into the environment. |
| Downsides | Ethanol absorbs dirt easily, which can potentially corrode and damage your engine. Ethanol also contains less energy, which can lead to lower gas mileage. |
| E85 | A blend of 85 percent ethanol and 15 percent gasoline. E85 is cheaper per gallon but vehicles using it travel fewer miles per gallon. |
| E10 | Regular gas that contains 10 percent ethanol and 90 percent gasoline. |
| E15 | A blend of 15 percent ethanol and 85 percent gasoline. |
| FFVs in the US | As of 2022, there were more than 20.9 million FFVs in the United States. |
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What You'll Learn
- Flexible fuel vehicles (FFVs) are capable of operating on gasoline and ethanol blends
- FFVs have an internal combustion engine and can burn any proportion of the fuel mixture
- FFV engines are optimised for gasoline, but higher ethanol blends can improve acceleration performance
- FFVs are factory-made, but many vehicle owners are unaware their car is an FFV
- FFVs are distinguished from bi-fuel vehicles, where two fuels are stored in separate tanks
Flexible fuel vehicles (FFVs) are capable of operating on gasoline and ethanol blends
Flexible-fuel vehicles (FFVs) are designed with an internal combustion engine capable of operating on gasoline and blends of gasoline and ethanol. They can run on pure gasoline, pure ethanol (E100), or any combination of both. The most common FFVs today use unleaded gasoline and ethanol fuel.
The flexibility of FFVs empowers consumers to choose their fuel depending on market prices. Ethanol is usually cheaper per litre, but since it contains less energy per volume than gasoline, FFVs typically get about 15%–27% fewer miles per gallon when fuelled with ethanol blends. Engines are optimized for gasoline, so fuel economy is generally lower with increased levels of ethanol. However, FFVs have improved acceleration performance when operating on higher ethanol blends.
The most common FFV in the world market is the ethanol flexible-fuel vehicle, with about 60 million automobiles, motorcycles, and light-duty vehicles manufactured and sold worldwide by March 2018. The four biggest markets for FFVs are Brazil, the United States, Canada, and Europe, led by Sweden. In Brazil, FFVs are optimized to run on any mix of E20-E25 gasoline and up to 100% hydrous ethanol fuel (E100). North American and European FFVs are optimized to run on E85, a blend of 85% anhydrous ethanol fuel with 15% gasoline.
E85 flex-fuel vehicles have been introduced in several countries, including Colombia, Australia, and the United States. However, the availability of E85 pumps is limited in some countries, such as Canada, where there were only three public E85 pumps as of June 2008.
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FFVs have an internal combustion engine and can burn any proportion of the fuel mixture
Flexible-fuel vehicles (FFVs) are designed with an internal combustion engine capable of running on multiple types of fuel. FFVs can run on pure gasoline, a blend of gasoline and ethanol, or pure ethanol (E100). The most common FFVs use gasoline and ethanol blends, with the ethanol content varying based on geography and season. This blend is commonly known as E85, containing 51% to 85% ethanol.
FFVs have an internal combustion engine (ICE) that supports the combustion of various fuel blends. In an ICE, the ignition and combustion of the fuel occur within the engine itself. The engine consists of a fixed cylinder and a moving piston. The expanding combustion gases push the piston, which then rotates the crankshaft, ultimately driving the vehicle's wheels.
FFVs use a dual-fuel system, supplying both fuels into the combustion chamber simultaneously in calibrated proportions. The engine can burn any proportion of the fuel mixture, as the fuel injection and spark timing adjust automatically based on the blend detected by a fuel composition sensor. This sensor, known as an oxygen sensor, reads the oxygen levels in the exhaust gases, enriching or leaning the fuel mixture entering the engine.
The flexibility of FFVs allows them to utilize blends such as E85, which has higher ethanol concentrations than regular gasoline. E85 is a blend of 85% anhydrous ethanol and 15% gasoline. This blend has a lower mileage per gallon than gasoline due to ethanol's lower energy content per unit volume. However, FFVs can also operate on pure gasoline, providing a choice of fuels for vehicle owners.
FFVs offer advantages such as improved acceleration performance with higher ethanol blends and the ability to use alternative fuels. They are available from automakers like Ford, Volvo, and Saab in various regions, including Europe, North America, and Brazil.
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FFV engines are optimised for gasoline, but higher ethanol blends can improve acceleration performance
Flexible-fuel vehicles (FFVs) are designed to run on gasoline or blends of gasoline and ethanol. They are equipped with internal combustion engines and can operate on any blend of gasoline and ethanol up to 83% ethanol (E85). FFVs are factory-made and many vehicle owners may not realise their car is an FFV, as they look identical to gasoline-only models. As of 2022, there were over 20.9 million FFVs in the United States.
While FFV engines are optimised for gasoline, they can also run on pure ethanol (E100) or any combination of gasoline and ethanol. The most common commercially available FFV is the ethanol flexible-fuel vehicle. FFVs have similar components to their conventional gasoline-only counterparts, except for an ethanol-compatible fuel system and a different powertrain calibration.
Although FFVs experience lower fuel economy (miles per gallon) with increased levels of ethanol due to ethanol containing less energy per unit volume than gasoline, they can exhibit improved acceleration performance when operating on higher ethanol blends. For example, the Koenigsegg Jesko 300, a flexible-fuel vehicle, produces over 1600 hp when running on biofuel, compared to 1280 hp on 95-octane unleaded gasoline.
The use of higher ethanol blends in FFVs can result in increased torque and horsepower, enhancing their acceleration capabilities. This improved performance is attributed to the combustion characteristics of ethanol, which contribute to a more efficient burn and, consequently, enhanced engine output.
In summary, while FFV engines are optimised for gasoline, the use of higher ethanol blends can lead to improved acceleration performance. This improvement results from the inherent characteristics of ethanol, which enable a more efficient combustion process and subsequently unlock greater engine potential.
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FFVs are factory-made, but many vehicle owners are unaware their car is an FFV
Flexible-fuel vehicles (FFVs) are factory-made vehicles with an internal combustion engine capable of operating on gasoline and any blend of gasoline and ethanol up to 83%. E85 (or flex fuel) is a gasoline-ethanol blend containing 51% to 83% ethanol, depending on geography and season. As FFVs are factory-made, many vehicle owners are unaware that their car is an FFV and that they can choose between fuels. This is because FFVs look similar to traditional gasoline-only cars, except for an ethanol-compatible fuel system and a different powertrain calibration.
FFVs have been around since the late 1990s, with Ford being the first manufacturer to introduce commercial FFVs in 1996. By 2006, Ford, GM, and Chrysler had pledged to double their FFV production, and other manufacturers like Audi, Nissan, VW, Mercedes, and Toyota also began producing FFVs. As of 2022, there were more than 20.9 million FFVs in the United States, with Brazil, Canada, and Europe also having significant FFV markets.
FFVs are distinguished from bi-fuel vehicles, where two fuels are stored in separate tanks and the engine runs on one fuel at a time, such as compressed natural gas (CNG) or liquefied petroleum gas (LPG). The most common commercially available FFV is the ethanol flexible-fuel vehicle, with about 60 million automobiles, motorcycles, and light-duty trucks manufactured and sold worldwide by March 2018.
While FFVs offer a choice of fuels, most FFV owners prefer to fill their vehicles with traditional gasoline. This preference makes the environmental benefits of FFVs mostly theoretical. Additionally, recent changes to Corporate Average Fuel Economy credits for FFVs have resulted in reduced availability of FFVs. However, FFVs have gained popularity due to their ability to be produced locally and their positive impact on the environment compared to gasoline.
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FFVs are distinguished from bi-fuel vehicles, where two fuels are stored in separate tanks
A flexible-fuel vehicle (FFV) is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, usually gasoline blended with either ethanol or methanol fuel. Both fuels are stored in the same common tank. Modern flex-fuel engines are capable of burning any proportion of the resulting blend in the combustion chamber as fuel injection and spark timing are adjusted automatically according to the actual blend detected by a fuel composition sensor.
FFVs are different from bi-fuel vehicles, where two fuels are stored in separate tanks and the engine runs on one fuel at a time. Examples of bi-fuel vehicles include compressed natural gas (CNG), liquefied petroleum gas (LPG), or hydrogen. The most common commercially available FFV in the world market is the ethanol flexible-fuel vehicle, with about 60 million automobiles, motorcycles, and light-duty trucks manufactured and sold worldwide by March 2018.
Ethanol flexible-fuel vehicles have standard gasoline engines that are capable of running with ethanol and gasoline mixed in the same tank. These mixtures have "E" numbers that describe the percentage of ethanol in the mixture, for example, E85 is 85% ethanol and 15% gasoline. E85 is a gasoline-ethanol blend containing 51% to 83% ethanol, depending on geography and season. The upper limit in ethanol content is set to reduce ethanol emissions at low temperatures and to avoid cold-starting problems during cold weather.
While fuel economy (miles per gallon) is generally lower with increased levels of ethanol, many FFVs have improved acceleration performance when operating on higher ethanol blends. FFVs are factory-made, and many vehicle owners are not aware that their car is an FFV and that they have a choice of fuels to use. Automakers in Brazil and Europe use badging in their FFV models with some variant of the word "flex", such as Volvo Flexifuel or Volkswagen Total Flex.
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Frequently asked questions
A flexible-fuel vehicle (FFV) is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, usually a combination of gasoline and ethanol or methanol fuel.
E85 is a blend of fuel that contains 51% to 83% ethanol and the rest gasoline. It is a type of flex fuel and is usually used in FFVs.
Flex fuel is a renewable and domestically produced alternative to gasoline. It burns cleaner than gasoline, reducing the number of toxic fumes released into the environment. It is also cheaper per gallon.
Flex fuel has a lower gas mileage, which means vehicles using it need to be refuelled more often. Ethanol, which is used in flex fuel, also absorbs dirt easily and can potentially damage the engine.
