Pros and Cons of Ethanol in Gas

Updated on January 25, 2019
All gas has been increasing the amount of ethanol.
All gas has been increasing the amount of ethanol.

What is ethanol?

Ethanol is the same type of alcohol that is found in an alcoholic drink. It's often used in motor vehicle gasoline as an additive. Our gasoline today contains roughly 10% ethanol, E10. With this fuel composition, it has close to the same amount of energy potential that straight gasoline does, only 2-3% less. And if you want to use ethanol fuel (E100), it takes 1.5 gallons of E100 to equal the same amount of energy given by 1 gallon of gasoline. So you ask why this would be so bad besides the increased cost of running a higher ethanol rated fuel? Why are people starting to use this gas more? Let's take a look at some of the bad and good about ethanol gasoline. We will talk about some general good news, bad news, and how ethanol effects small engines a little more specifically. I always like hearing the bad news first.

How to increase gas mileage

Gas mileage decrease

One of the bad things that happens with ethanol is that your mileage will actually decrease. The New York Times stated that E10 gasoline, which is the gas we use in America, actually gives you 2-3 miles per gallon less than gasoline. E85 is a flex-fuel with 85% ethanol loses 7-8 miles per gallon. With gas mileage decreasing, you need to buy more fuel for the same distance and while writing this the average price per gallon for E85 is $3.30. The average price for gasoline is $3.86 while writing this.

Now, my vehicle gets around 21 gallons per mile, unless I am hauling something. Cutting my mileage down by 25% makes E85 a more expensive option for me. To accomplish the same mileage per gallon it would cost me $3.86 for gasoline and $4.13 for E85. Do not let the price per gallon fool you if you are looking for cost efficiency.

Ethanol and Small Engines

One of the issues with ethanol is that it attracts water and it does break down faster than gasoline. This is not much of an issue with transportation vehicles. But with small engines this can be a huge problem.

With water absorbing into the fuel, there is the chance that rust will form on the interior of the engine. For obvious reasons, this is bad for any piece of equipment. The particles that get into the gas from rust flakes will clog up the fuel filter sooner or later. It is possible that these flakes will also cause damage to the pistons, rings, seals, and any number of other components of the engine.

Ethanol increases gasoline vapor pressure which may cause a vapor lock in the carburetor. This fuel starvation will prevent the engine from starting. This is an issue in higher altitudes and hot weather. Make sure to be storing gasoline with an ethanol mixture properly and to use it in a timely fashion.

Gasoline with ethanol decreases the life of the engine and its parts. The alcohol is not good for seals and causes a quicker break-down. Having a cleaning agent like this constantly in a small engine that was not engineered for this fuel mixture simply ages it at a faster rate.

The ethanol in E10 gas breaks down quickly. An MTD area representative informed me that E10 begins to break down within 3 weeks. This break down creates clumps in the gasoline mixture at some point and this may clog the filter, carburetor, fuel line, etc. To help prevent this a person should purchase a product such as Sta-bil and add it as directed to their gas. This will help prolong the life of the gas and keep it from harming your small engine as much. Talking with an area small engine repair shop, the E10 breaking down is the major cause of equipment being sent in. And after inspection, diagnosis, repair and testing it generally cost between $50.00 and $60.00 even when the issue is simply bad gas. They drain the system and add new gas that has a stabilizer in it after diagnosing the issue.

These issues are more dramatic with small engines, but they also occur with transportation vehicles. The difference being that transportation vehicles are now being designed for this gasoline, but there are still effects such as above that occur - just on a lesser scale.

How ethanol is good

In the United States, ethanol is created from corn. The largest crop produced in the United States, roughly 72,700,000 acres of land go towards growing corn. During the time of writing this hub that is about $15,100,000,000 per year. Approximately 7% of the national corn yield went into making ethanol in 2001 and that increased to about 39% in 2010. And some of you may be wondering way.

One of the political reasons for using ethanol over gasoline is to prevent America from heading into a greater mercy hold of foreign oil producing countries. Which is a good reason for a purely political nation. But let's look at some of the propaganda that the government is using to get people really behind this change.

Ethanol is a much cleaner than gasoline. In 2006, Wisconsin had 16 percent fewer high-ozone days than the inception of E10 in 1994. With less pollution being released into the atmosphere we are helping our world stay healthier for longer. This is definitely a great reason to use fuel with higher levels of ethanol.

The use of more ethanol will create more jobs for Americans. By creating more manufacturing jobs to produce more ethanol we are creating a solution for the American worker that is out of work. America helping Americans.

Because ethanol is alcohol, your gas lines will not freeze during the winter months. This is a good side effect of using higher levels of ethanol. Although, I wouldn't guarantee this world wide, but for most climates that have human residence - it is a safe bet.

Overall, the two main reasons for having America change from gasoline over to a high percentage ethanol fuel is to take away the oil-based power of the middle east and the second is that it will help our planet with the cleaner burn.

More on the penny

The cost for the United States Mint to produce and distribute the cent and nickel rose to their highest levels, and are now more than double the respective face values. For the fiscal year ending September 30, 2011, the unit cost for the cent was 2.41 cents and the cost for the nickel was 11.18 cents.

Looking more into the clean burn

I agree that we need to be more environmentally conscious. But it seems the change from gasoline to E85 is much more political than health conscious. For each gallon of ethanol created there is a tax break of $0.51 that comes from the Federal Highway Trust Fund. This is a guaranteed amount, it reminds me of a corn farmer outreach system. It will be interesting to see if this will perpetuate an increase in corn prices by creating a static demand for corn.

Another interesting fact is that sugar cane is actually a much more cost efficient resource for creating ethanol. Six times more efficient, actually. But since America does not grow it we have placed a $0.54 tariff on sugar ethanol imported from Brazil. This leads to using the more inefficiently produced corn ethanol. And creates more jobs for the American people.

The bad part is that we use more energy to make ethanol than the ethanol will produce. This reminds me about the United States penny. We use something that holds a value of $0.01 but it costs $2.41 to produce a penny. What I do not understand is with a tax break being issued for ethanol we set a minimum value on corn. Which increases the cost of corn for food production. Sooner or later the price of the tax break will increase, and thus increase food production - etc. And if you have agricultural animals, you know that prices have jumped over the last couple years. Even bird seed has increased quite rapidly.

President Obama is requiring that automobiles have the flex-fuel option in hopes that people will use this option. The more people who use this option means that we will use a greater percentage of the national corn yield towards ethanol gas. And this increases the cost of food products, which creates competition for the ethanol fuel. Notice that this is the second time that I have mentioned this - it is important. And 328 gallons of ethanol can be created from 1 acre of land.

So in 2011, with the total acreage of land used for corn puts the United States at a total of 23,845,600,000 gallons of ethanol in one year of 100% of all corn is put towards ethanol. If we changed over to E85 we could produce 27,422,440,000 gallons of E85 if there was no waste. In 2005, the United States consumed 386,000,000 gallons - a day. So if we used all of our corn towards creating E85 fuel, we would be self-sufficient, for 71 days.

What do you think about ethanol?

Is E85 fuel the answer to current gas issues?

See results

Alternative fuels

I am not against alternative fuels. I simply wish that as a nation we would get behind a fuel that is more realistic to produce to be self-sufficient. I would love to see this world be healthy for future generations. I worry about the world my children will live in and try to teach them how to care for what we have. But it seems that the biggest concern from many of our politicians it what they can get the American people to believe and make themselves look good. Ethanol fuel would be a great idea if it were more realistic. When you create competition between a food staple and transportation, then the concept doesn't seem too plausible without increasing the cost of food products.

If you have any comments, please leave them. I would be interested in knowing your point of views and opinion. If you agree with this share it and let your friends and families read it. We need a nation of people questioning our nation's goals during this time in history.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

  • In MO, we can get gas without ethanol. If I mix it 50/50 with ethanol gas (making about 5%) is there any benefit like making the gas ok or so Sta-bil will last longer? The issue is with classic cars that aren't driven much. And is ANY ethanol a problem? Should I drain the tanks completely before putting in ethanol free gas?

    I would drain the tank and then add new. In most cases, you can get by with a mild ethanol blend but it would matter on the date of a vehicle and require more specific knowledge.

  • When it takes a gallon of diesel fuel (Farm tractors and shipping product by trucks), how is Ethanol less polluting to our environment than gasoline?

    There are many studies that say if you look at production from start to finish, then ethanol does not produce less pollution.

  • Wasnt ethanol was first blended with gas to replace MTBE which was an additive used with regular gas which was cancer-causing and found leaching into groundwater? At 10 percent, this was a valid solution? I'm not sure about higher rates.

    MTBE is controversial, but I do believe in some countries still used in low quantities. MTBE is not classified as a human carcinogen though.

  • Should the U.S. put 10% of ethanol in their gas?

    With the issues and inefficiency in conversion, I don't think ethanol is a great option to enforce.

  • Why don't we use more natural gas or propane?

    I would assume it is because of politics as well as supply and demand.


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    • profile image


      13 hours ago

      I use Shell's V-Power here in Canada in my 2013 Honda CR-V and it contains no Ethanol. I see that I'm getting better gas mileage. As far as I'm concerned Ethanol is a Government ripoff. I can't buy 100% regular gas here, it doesn't exist. We have little choice here and I feel like the Government here in Canada is forcing this Ethanol down our throats.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      2 weeks ago from Norwalk, Ohio

      Travis, I appreciate your perceptive. With the increase of ethanol there was an increase in corn price. There was also an increase in corn yield as some farmers changed crops to take advantage of this and increased prices in other commodities as well. E85 lowers some pollutants and increases others. We don't have too much corn, we export it to other countries and make a profit. Lobbyist are supported, they don't have money themselves. Farmers can hire lobbyists as well. The answers are somewhat segmented, hope it is understandable.

    • profile image


      2 weeks ago

      People are misinformed.

      .We don't eat corn, cows do

      .E85 is safe on engines. It is hard to start when cold with cars with

      carburetor, not fuel injected.

      .We have way too much corn that we can't get rid of, so more ethanol

      would help get rid of some.

      . alcohol burns burn really clean just like LP

      . Oil lobbies have way more money than farmers do. That's the only

      reason we don't use more ethanol

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      4 weeks ago from Norwalk, Ohio

      Wood fuel, solar, wind, electrical, and any number of other sources if there were the desire.

    • profile image


      4 weeks ago

      hey, what if there is a global catastrophe and corn dies out what other natural gas could we make or even use besides gasoline.

    • profile image

      Eugene L. Perkins 

      6 weeks ago

      I us e85 and i like doing my part to help

      Our air. I change my oil and us a k&n air & oil filter.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 weeks ago from Norwalk, Ohio

      Marc I do not have access to my computer currently, when I do I could contact you and let you know.

    • Marc J Rauch profile image

      Marc Rauch 

      6 weeks ago from Northern California

      Where was the Esso station shown in the story photograph?

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      4 months ago from Norwalk, Ohio

      The coral reefs are much more important than people realize.

    • profile image

      Nita Bruno 

      4 months ago

      With a growing population and a concern about a sustainable food source (expanding deserts, 50% loss of coral reefs, and the negative effect of climate change on our environment, I really don't think using our land to grow food to use as fuel is very logical. We need to preserve our soils for food, not fuel. We need to be conscientious about transportation and alternatives not land use for fuel.

      Lets put greed aside and come up with environmentally safe solutions to our transportation and pollution issue. Love our planet.

    • profile image


      8 months ago

      Ethanol is a political scam that was enforced by people that invested into the corn industry

    • profile image


      8 months ago

      At the time I took the pole if Ethanol solved the current gas issues 14 percent said yes, 67 percent said no, and 19 percent said possibly. So 33 percent of respondents Either can't read or are morons.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      15 months ago from Norwalk, Ohio

      I am not an expert, but since it was introduced in 1997 I would assume it doesn't have any issues with any version of it.

    • profile image


      15 months ago

      can i use it on my clk200 kompressor supercharge?

    • profile image

      jerry cornett 

      17 months ago

      u should never use a good food product to make fuel for auto's.maybe we need to walk more.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      20 months ago from Norwalk, Ohio

      @Tyler: read up on some of the research from Mark Jacobson . Here is another interesting article:

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      20 months ago from Norwalk, Ohio

      Your theory is pretty interesting, but if a vehicle in reality did get 8 mpg on E10 then E85 would most likely damage the engine and get the 0 mpg you are talking about. At first glance, what I take as a condescending tone in your writing annoyed me. It appears that your reading was very limited and short-sighted. At the time of this article, the loss wasn't 33% as you state either. But overall, I do owe you a thank you. I realized that I didn't include a source link and assumed that people would know I was talking about national average. Two errors that your comment made me realize I made. Thank you. I will either edit and correct these are re-write the article.

    • profile image


      21 months ago

      You would not get 7-8 mpg less if using E85... Who ever wrote this argicle obviously does not understand ratios and percentages. For example if your car gets 8 mpg on E10 then using E85 would get you 0 mpg according to this article. In reality you would actually get 2/3 the mpg of E10 using E85. Which would a loss of about 3 mpg in this example.

    • profile image


      22 months ago

      Ethanol is a cleaner burning fuel and it is better for the enviroment.

    • profile image


      23 months ago

      "An MTD area representative informed me that E10 begins to break down within 3 weeks. "


      WHAT! I drive so little that I only fill up once every TWO months! So what is this crappy fuel doing to my engine (2015 Highlander)?

    • profile image

      M A Yeager 

      2 years ago

      Here it is 2016 already and the argue goes on, The Oregon legislature is unwilling to listen to the opponents of the requirement of ethanol in our auto fuel. In Oregon we have Premium gas without ethanol for our motorcycles, boats and small engines.

      The fight here is to get rid of ethanol entirely.

      Why are there no government studies to determine how the addition of ethanol either enhances or detracts from the efficiency of motor vehicle use?

      I suspect it is because the government doesn't want the population to know the true facts. After all, the government is in this mess up to their economic necks and are unwilling to admit they made a mistake.

    • profile image


      2 years ago

      One thing not covered in your article is the fact that older vehicles do not fully burn the ethanol and that leads to catylitic converter failure

    • profile image


      4 years ago

      i agree with davesworld

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 years ago from Norwalk, Ohio

      I think it is already getting hard to come by. I do like the idea, but the reality of it is that its not a good move. Now wood gas on the other hand, I think it has a lot of potential - especially when you own land.

    • eaglecreek profile image


      6 years ago from Vilonia , Arkansas

      I will for sure make ethanol in the near future. Its pretty cheap to make. As for bio diesel/veggie oil, im a bit skeptical. The people that sell the bio diesel kits lead you to believe that every restaurant out there is willing to give away 50 plus gallons of old cooking oil a week. It makes no sense when diesel is so expensive. If you could get it for free/cheap, it wont last long as people realize how valuable the old oil is.

      That's my thoughts but what do I know im just a simple country boy

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 years ago from Norwalk, Ohio

      I wasn't aware of this yield. I would be interested in knowing as well. I know sweet feeds have a shelf life of 110 days in most stores, so it would seem that even when processing it that there would be a high level of sugar. I have been thinking about getting an old truck and converting it to wood gas. There is also getting an old diesel car and converting it to vegetable oil, but the wood gas would be more efficient. Talked to one guy today who gets 26 miles per gallon on veg. oil.

    • eaglecreek profile image


      6 years ago from Vilonia , Arkansas

      CJ – I agree with you, our gov seems to leave all the intelligent people in this country scratching their head. Its as if they try to make everything work on the opposite end of efficient, and mainstream america wonders why we have so much debt lol.

      I live in rural Arkansas in the Mississippi delta area. My grandfather told me when he was young they grew sorghum cane anywhere they wanted for molasses. I always wondered what kind of ethanol yield one could get from this being as its so inefficient to grow sugar.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 years ago from Norwalk, Ohio

      The problem is that in the United States there is a tax break on corn that is used for ethanol. Other crops in the US do not have as much sugar, I guess one of the other crops that could be used would be carrots, but I have not heard of this. In South America you have sugar cane, but it doesn't grow the best in North America. And they put a high tax on sugar cane imports in the United States. How the US is handling this is a bad situation.

    • eaglecreek profile image


      6 years ago from Vilonia , Arkansas

      Great article, I love studying energy.

      Interesting how the anti ethanol people lead you to believe corn is the only foodstock ethanol can be made from. There are so many other crops that can be grown to make ethanol and give you a much greater EROI (energy return on investment).

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 years ago from Norwalk, Ohio

      Yeah, and this is only one subject that's surface is scratched. The old natural gas scare and now the oil scare and all the hype. But people seem to be following more and questioning less.

    • putnut profile image


      6 years ago from Central Illinois or wherever else I am at the moment.

      I could have and should have written this hub. Almost all of it I already knew and get irritated by. The lies and deception that most people simply buy as truth amazes me. Good job making the facts so many are unaware of clear. I hope this gets a lot of readership.

    • CJ Andrews profile imageAUTHOR

      Chris Andrews 

      6 years ago from Norwalk, Ohio

      In Ohio, it seems like quite a few people are believers. But the whole process just doesn't make sense to me. Thanks for your comment Dave.

    • Davesworld profile image


      6 years ago from Cottage Grove, MN 55016

      Ethanol is a scam designed to ensure reelection of farm belt Congresscritters. No nation can survive by burning up its food supply.


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