Flex-fuel has existed for a long time, and it’s gaining popularity, even so, many people don’t know about it. It is cheaper than regular fuel. Should you opt for a car that uses flex fuel, and why is it cheap? What is flex fuel in the first place?
Whether you want to invest in this type of fuel or you want to know what that new sticker at a gas station means, we got you covered.
Here, you will learn “what is flex-fuel for cars” and its pros and cons. Let’s keep the ball rolling.
What Does Flex Fuel Mean?
The flex fuel is any mixture of a gasoline-ethanol blend but the flexible-fuel vehicles (FFVs) in the United States have engines optimized for E85.
It contains 51 to 83 percent of ethanol. It is possible to design an engine that will run on pure ethanol but it is not a viable option.
The engine of an FFV can run on two fuel types simultaneously and both are stored in the same tank
The modern cars have a fuel composition sensor that adjusts the spark and fuel injection timing to detect the percentage of the ingredients in the blend. For this reason, it can burn any proportion of gasoline-ethanol mix in the combustion chamber.
The FFVs are not similar to the bi-fuel vehicles. The latter stores two types of fuel in separate tanks and the engine uses one fuel at a time.
How Does Flex Fuel Work?
We caution against filling your tank with flex-fuel before your next outing without doing some research.
While it may seem like a conscientious choice, not all vehicles are well-equipped to use ethanol. While most modern models can run on this fuel, too much can corrode parts of your fuel system.
The skeleton of a flex fuel vehicle (FFV) isn’t too different from that of a gasoline one. It uses an internal combustion setup but may require ethanol-specific parts to detect the fuel’s contents and adjust accordingly.
A flex fuel sensor quantifies how much ethanol is blended in. The exact amount of ethanol in your fuel will vary depending on the time of year, and this device allows your vehicle to function normally at any ratio.
The sensor’s results are translated into volts by the Ethanol Content Analyzer (ECA), which are fed into the Electronic Control Unit (ECU).
Finally, the ECU dynamically calibrates the engine. Since the ECU is a built-in computer, it can dynamically update itself and change how various parts of the vehicle operate. This process is repeated throughout your drive so your car remains efficient.
What Is The Difference Between Flex-fuel And Regular Fuel?
Here are the differences between flex-fuel and regular gas.
Purse control
Ethanol produces less energy than gasoline-only fuel. This means an engine needs more ethanol in the combustion chamber to produce the same energy as regular gas.
Flex-fuel vehicles have a higher purse range in the fuel injection, allowing an extra 40% liquid fuel in the air-fuel mixture ratio. The advanced electronic car sensor can detect the amount of ethanol and allow a proper fuel mixture for a better concentration.
Fuel system components
Ethanol has more corrosive agents than gasoline. This means that it corrodes internal engine components. However, automakers are fighting this downside to ethanol.
That’s why you won’t see rubber, aluminum, or magnesium parts inside the fuel tank. Instead of using terne-plated steel for producing gas tanks, automakers use stainless steel material. And the fuel lines feature plastic-lined stainless steel.
Extra features
Since ethanol is conducive, meaning they carry electricity flow, auto manufacturers added extra safety measures. For example, automakers include safeguards against arcing design for tank-mounted fuel pumps.
The next is water contamination in ethanol, leading to high formic acid in the combustion chamber. To prevent causing catastrophic damage in the combustion chamber, automakers recommend using acid-neutralizing engine oil.
Pros and cons of Flex-fuel
As the saying goes, ‘whatever has a sweet part also has a bitter part.’ Flex-fuel is not an exception to these rules. Let’s look at the pros and cons of flex-fuel.
Pros
Let’s take a look at some of the pros and cons of switching to a flex-fuel vehicle:
#1. Fewer Emissions.
Ethanol burns cleaner than gasoline. As a result, flex-fuel vehicles emit fewer greenhouse gases than traditional, gasoline engine-equipped vehicles, making them the more environmentally friendly option.
A common flex-fuel gasoline blend contains anywhere between 51% to 83% ethanol. Compared to regular gasoline, the average tailpipe emissions of E85 gasoline contain 23% less nitrogen oxide and 30% less carbon monoxide.
#2. Burning Facility.
A flex-fuel vehicle has the ability to burn different proportions of ethanol and gasoline. This is a significant feature because conventional engines can only burn fuels that have a small amount of ethanol.
These vehicles are outfitted with electronic sensors that measure the fuel’s blend. The engine’s computers can then control the fuel injection and timing based on that measurement.
#3. More Sustainable.
Since ethanol is produced from crops such as corn and sugarcane, it can be sustainably produced. Given that there is a rising global demand for oil, alternative sources of fuel help conserve this non-renewable resource.
#4. Tax Benefit.
Customers who drive flex-fuel vehicles are eligible for tax credits that can greatly reduce or even eliminate their tax obligations. Tax credit amounts vary depending on the vehicle’s gross vehicle weight rating (GVWR).
#5. No Loss in Performance.
Even though ethanol has less energy density, flex-fuel vehicles can still achieve the same level of performance as their gasoline-powered counterparts. However, this comes at the cost of being less-fuel efficient.
Cons
Despite having obvious reasons to choose a gasoline-alternative, flex fuel is not free of flaws. Here are the points to believe that everything is not rainbow and glitter.
#1. Not Quite Eco-Friendly.
Ethanol yields fewer greenhouse gasses but it produces more smoke-causing chemicals than petroleum oil. Many ethanol plants also use coal instead of natural gas as their primary energy source, which is not good for the environment.
#2. May Cause Corrosion.
Being a type of alcohol, ethanol breaks down faster than gasoline and attracts water. As it causes water absorption into the fuel, it may lead to the forming of rust in different engine parts. Plus, the rust particles can clog the fuel filter.
#3. Damaging the Engine.
If you are driving in hot weather or high altitude, the use of ethanol-mixed fuel may cause a vapor lock in the carburetor by raising the vapor pressure.
For this reason, the engine will not get adequate fuel supply for kicking off. Plus, the alcoholic liquid is not good for the seals, leading to premature breakdown.
#4. Possible Increase in Food Prices.
The two chief raw materials for ethanol production are corn and sugarcane – both of which are food crops.
Using them for the mass production of flex fuel may increase their prices as human and animal food products. Plus, a big-scale cultivation will take a huge amount of land that can otherwise be used for different purposes.
#5. Less Fuel-economy.
Flex fuel costs cheaper than gasoline but the reduced fuel economy is nothing that you’d hope for. Every gallon of ethanol-gasoline mix produces 25% fewer miles on an average than a gallon of petroleum oil.
Is Flex-Fuel Better Than Gas?
While a gallon of E85 fuel is usually cheaper than a gallon of gasoline, it actually costs more per mile. Ethanol contains less energy per volume, which means you get around 15% to 27% fewer miles per gallon than gasoline-powered vehicles.
However, keep in mind that your car’s actual mileage can still vary depending on its condition and your own driving habits.
What Vehicles Take Flex-Fuel?
You’ll find plenty of older vehicles with engines that can take flex-fuel. All you have to do is look for a yellow filler cap or a “flex-fuel” badge on the car body.
Today, however, modern flex-fuel vehicles are mostly comprised of full-size pickup trucks and cargo vans by Ford and General Motors.
Now that you know the answer to the question “What is flex-fuel?”, you’ll hopefully appreciate how fuel technology has improved over time. You might even realize that you own a flex-fuel vehicle–and now you can get more out of it than before.
Can You Mix Flex Fuel and Regular Gas?
Yes, you can add gasoline to your existing flex fuel and vice versa. The changes to a vehicle’s fuel system are meant to accommodate the addition of ethanol. Nothing is altered that would affect how the vehicle handles pure gasoline.
Compatible vehicles are safe with up to an 83 percent ethanol ratio. They are not tested for mixtures surpassing that proportion, but this shouldn’t be an issue unless you’re adding pure ethanol to your tank.
We recommend only diluting your fuel yourself if your vehicle is equipped with a sophisticated sensor that tells you your fuel’s ethanol levels.
FAQs.
Q: Can you use regular gas in a flex-fuel vehicle?
Yes, you can use regular gas in flex-fuel vehicles without incurring damages. The flex-fuel engine is designed to run efficiently on ethanol and other fuel types.
Whether you have gas blended with methanol and ethanol, or regular gas, put it in the flex-fuel vehicle. It’s all going in the same tank.
You may ask, what is a flex-fuel engine? Flex-fuel engines are vehicle engines on flex-fuel vehicles (FFV).
Q: Is flex-fuel gas or diesel?
Is flex-fuel gas or diesel? Flex-fuel, also known as flexible fuel, is a type of fuel combined with gasoline and methanol or ethanol.
Vehicles running on this fuel type are designed to be run on more than one fuel type. Flex-fuel also offers various merits over conventional diesel or gasoline vehicles.
Q: Can you put diesel in a flex-fuel?
No. Diesel fuels are not compatible with any engine aside from diesel engines. Diesel differs from gasoline and ethanol fuels and will not work in as an alternative.
A critical example is, if you pour diesel into a gasoline engine, it’ll not run. In the same manner, diesel will not run in a flex fuel vehicle.
Q: Can you mix E85 with regular gas in a flex-fuel vehicle?
Yes. As long as you’re driving a flex-fuel vehicle, mixing E85 with regular gas will not cause any problem.
A computer in the flex-fuel vehicle will adjust the fuel blend up to 85 ethanol. However, you may notice a reduction in miles per gallon and acceleration depending on the E85 you mixed.
Q: How much does a flex-fuel kit cost?
What is a flex-fuel kit, anyway? A Flex-fuel kit is a kit that controls the fuel injection process. It controls each of the injectors separately to provide optimal fuel flow. It works pretty fine on various fuel injection approaches.
Converting your gasoline to a flex-fuel vehicle will take around 15 minutes. The flex-fuel kit will cost around $365 to $500. However, this kit works fine on vehicles that use both fuel port and electronic fuel injection via the engine control module.
Q: Is flex-fuel cheaper than regular gas?
Flex-fuel is cheaper per gallon than gasoline but a bit costlier than gasoline per mile. As explained above, ethanol fuels have less energy content than gasoline.
That makes it consume more gas when driving. Therefore, as flex-fuel costs less at the gas station, the decrease in MPG makes it costlier than regular gasoline.
Q: What if I accidentally put flex-fuel in my car?
If you accidentally put flex fuel in your car, do not panic. While the check engine light may illuminate on the dashboard, it won’t cause any harm to your vehicle.
You’ll be fine until the fuel burns out of the gas system. You won’t want to run out of gas on the road. So, top up your tank when the low fuel light comes up on your dashboard.
Final words
At this juncture, we’ve cleared the air on the subject, ‘what is flex-fuel?’ The debate on the pros and cons of flex-fuel is disappearing soon as there seems to be a significant switch from regular gas to flex-fuel vehicles.
The number of ethanol refining plants is increasing daily. So, even if it’s not what you want yet, weigh the pros and cons and compare it with regular gas.
The automotive industry keeps evolving. Though we don’t know what the future holds for us, we can guess from observing the signals.