Ethanol Deception - Is It Really Better Than Gasoline?

[Ivan Seeking]

I was just watching a review of ethanol energy on CNN. They report that Consumer Reports claims that cars using ethanol see no decrease in mileage or performance.

Now I'm not sure what Consumers Reports claimed and a source wasn't cited, but the point of the story was to consider the performance of ethanol compared to gasoline, which was left somewhat vague in the end.

Gasoline has about 125,000 BTUs per gallon, and ethanol has about 76,000 BTUs per gallon. The last time that I checked, the conservation of energy law was still in effect.

Sidebar: IMO, nothing that Consumer Reports claims can be believed. This is not the first time that I have run across this sort of nonsense. In fact, just about anytime that I see a report from them on something that I happen to know about, they're wrong.

 

[JasonRox]

If the consumer doesn't feel like it decreased in performance or mileage, who gives a ****. The consumer is happy period.

It's not like they're saying it's scientific. It's a Consumer Report.

 

[Ivan Seeking]

If the consumer doesn't feel like it decreased in performance or mileage, who gives a ****. The consumer is happy period.

It's not like they're saying it's scientific. It's a Consumer Report.

It is a report FOR consumers that is supposed to be based on testing. Many people rely on their information when making buying decisions. Also, people are hoping to save money by buying ethanol fuel, when in fact the decrease in mileage will likely end up costing more than the savings gained by purchasing a cheaper fuel.

In order to replace petroleum with corn-ethanol, it would require about twice the land area of the US to grow the corn.

…a bushel of corn (56 pounds) on the Chicago Board of Trade has jumped from $1.86 at the end of 2005 to over $4 today…

Beef and poultry prices are likely to rise as animal farmers rely on corn for feed. … the price rise has already bumped up wholesale chicken prices 6 cents per pound.

Corn derived products serve a range of users including the food and beverage, pharmaceutical, paper products [corrugated and laminated paper], the textile and brewing industries, as well as the global animal feed markets.

"It ripples right across the economy.“

Reuters, May 19th, 2007.

 

[BobG]

I was just watching a review of ethanol energy on CNN. They report that Consumer Reports claims that cars using ethanol see no decrease in mileage or performance.

Now I'm not sure what Consumers Reports claimed and a source wasn't cited, but the point of the story was to consider the performance of ethanol compared to gasoline, which was left somewhat vague in the end.

Gasoline has about 125,000 BTUs per gallon, and ethanol has about 76,000 BTUs per gallon. The last time that I checked, the conservation of energy law was still in effect.

Sidebar: IMO, nothing that Consumer Reports claims can be believed. This is not the first time that I have run across this sort of nonsense. In fact, just about anytime that I see a report from them on something that I happen to know about, they're wrong.

I'd say they might be right depending on exactly what they said. The fuel going in may have a difference in energy content, but a lot of energy is lost between the 'in' and the 'output' - how much energy is applied to turning the tires. You have to take into account how efficient the combustion process is.

If the engine is designed for high ethanol fuels (i.e. - the engine has a high compression ratio), ethanol's performance is supposed to be roughly equivalent to gasoline. The engine wouldn't run at all on gasoline, which would currently be a pretty big drawback.

This wouldn't apply to flex fuel engines that can run on ethanol or gasoline. To use gasoline, the engines have to run with a lower compression ratio and you get much worse mileage with ethanol than you do with gasoline. In other words, you're right - in the same engine, it's impossible to get the same mileage out of ethanol that you do with gasoline.

The 10% ethanol mix that can be used by all engines also gets less miles per gallon than straight gasoline (about 3% less?), but the increase in octane gives better performance in other ways - I'd say it was a push depending on the driver's priorities.

 

[Ivan Seeking]

What is roughly equivalent, and where are these cars? I don't know of anyone driving one. Is this verifiable or more Consumers Reports information?

I don't see how after all of years of improvements in auto engines, we could get the same energy from 76,000 BTUs, as we do 125,000 BTUs.

 

[MeJennifer]

Simply Not True

I was just watching a review of ethanol energy on CNN. They report that Consumer Reports claims that cars using ethanol see no decrease in mileage or performance.

Well before what you call "this sort of nonsense" and "deception" it might be good to do some due dilligence.

If we go to CNN.com we can find the article http://www.cnn.com/2007/AUTOS/05/24/cr_mpg_survey/index.html" placed today on the CNN website.

Nothing in this article indicates that Consumer Report claims anything like that.

If we look a bit further and go to the Consumer Report website we can find several articles where Consumer Reports states that ethanol is not more fuel efficient.

I include two articles:

(1) http://www.consumerreports.org/cro/cars/pricing/alternative-autos-and-fuels-1105/renewable-fuels/index.htm"

From this report:
"Ethanol contains less energy per gallon than gasoline, so E85 gets roughly 30 percent fewer miles per tankful. Factoring in that loss, corn-based ethanol sells for about $4.09 for the energy equivalent of a gallon of gasoline, making it more expensive than gasoline at today's prices."

(2) http://www.consumerreports.org/cro/cars/new-cars/ethanol-10-06/overview/1006_ethanol_ov1_1.htm"

Your suggestion that Consumer Report is deceiving people by claiming that ethanol is not less fuel efficient is simply untrue. In fact Consumer Report is saying the contrary.

 

[Ivan Seeking]

I just saw it on CNN. Also, I said that they didn't cite a source

Usually what happens is that I see the report and it becomes available later for a link.

Now I'm not sure what Consumers Reports claimed and a source wasn't cited, but the point of the story was to consider the performance of ethanol compared to gasoline, which was left somewhat vague in the end.

 

[MeJennifer]

I just saw it on CNN.

Well then, shame on CNN.

Here is the Consumer Report press release:
"[URL buyers seek fuel efficiency, but remain wary of trade-offs
[/URL]

 

[Ivan Seeking]

Perhaps... we will see later what is linked.

 

[Ivan Seeking]

In any event, ethanol has a reputation that is not deserved. It is a solution to nothing and puts food into competition with energy.

 

[Astronuc]

Certainly CNN is not scientific, but I believe Consumer Reports tries to be with a very limited sample, particularly when it comes to expensive items.

One thing CR cannot do is vouch for qualit (or quality control) of any particular item. We have relied on them, but with mixed success, although the experience has been more positive than negative.

 

[Ivan Seeking]

I've seen too many false claims to believe anything they say.

I had a buddy who owned the vacuum shop in town, and one day he showed me a CR on two Eureka vacuum cleaners. One passed with flying colors and the other failed. What Tony was so amused with is that the only difference between the two models was the paint and decals.

 

[Ivan Seeking]

In fact, I'll do a little digging and see if I can find it, but, IIRC, some years ago they got caught on something like this and blamed it on outsourcing - they don't do much of their own testing.

 

[MeJennifer]

Talking about false claims, did you read the two links from Consumer Reports that I included? If you did you will have to admit that the statements about deceptions in this matter are simply unfounded.

 

[russ_watters]

I was just watching a review of ethanol energy on CNN. They report that Consumer Reports claims that cars using ethanol see no decrease in mileage or performance.

Now I'm not sure what Consumers Reports claimed and a source wasn't cited, but the point of the story was to consider the performance of ethanol compared to gasoline, which was left somewhat vague in the end.

Gasoline has about 125,000 BTUs per gallon, and ethanol has about 76,000 BTUs per gallon. The last time that I checked, the conservation of energy law was still in effect.

Without knowing the nuts and bolts of the claim, it is tough to evaluate, but thermodynamically, "miles per gallon" (and therefore btu per gallon) is a largely useless thing to compare between fuels. The reality is that if you want to use ethanol in a car, you should change-out the fuel injectors to inject more ethanol, giving you in the end almost exactly the same thermodynamic efficiency and performance, but with more per-gallon or per-lb consumption.

Along a similar veign, most natural gas home heating furnaces can be converted to run propane and the basic difference is the orifice regulating the flow is different. Change-out the orifice and the performance is identical.

What is more useful is probably the chemical efficiency of the fuel. It is related somewhat to energy density, but fuels with a higher ratio of carbon to hydrogen (such as ethanol) produce less energy and more CO2.

 

[brewnog]

Energy content is pretty meaningless for performance comparisons between fuels. Ethanol is much more knock resistant than gasoline, therefore higher compression ratios can be utilised. Even on an unmodified (or gasoline) engine, ignition timing can be advanced, and charge density is increased due to the heat of evaporation of ethanol.

I'm not saying performance on ethanol is identical to that on gasoline, but then a gasoline-optimised engine isn't identical to one designed (or modified) for ethanol.

 

[BobG]

What is roughly equivalent, and where are these cars? I don't know of anyone driving one. Is this verifiable or more Consumers Reports information?

I don't see how after all of years of improvements in auto engines, we could get the same energy from 76,000 BTUs, as we do 125,000 BTUs.

You don't see any 100% ethanol engines on the road. For one thing, there's no where to fuel them up. You can see 33 of them on Sunday in the Indianapolis 500.

About the closest you might see functionally would be MIT's ethanol-boosted engine that only injects ethanol directly into the combustion chamber when extra power is needed. (http://web.mit.edu/newsoffice/2006/engine.html and http://www.psfc.mit.edu/library1/catalog/reports/2000/06ja/06ja016/06ja016_full.pdf ) That's far from being on the road, either.

 

[Ivan Seeking]

Talking about false claims, did you read the two links from Consumer Reports that I included? If you did you will have to admit that the statements about deceptions in this matter are simply unfounded.

If you read the op, the claim of deception was applied to the use of ethanol. This was not primarily about Consumer Reports. I just happen to know from experience that CR is sometimes full of it, so the report didn't surprise me.

I will post the story a little later as it should come up after a few hours.

 

[Ivan Seeking]

You can see 33 of them on Sunday in the Indianapolis 500..

Just for perspective, didn't I hear that the use of ethanol was not based on performance, but other motives?

 

[Ivan Seeking]

Okay, I wasn't aware of the higher compression ratios possible, but since these cars are not available and the reality is what we actually have, ethanol probably offers no financial advantage.

And for anyone who want to do the calculation, when you see the 400 gallon per acre yields for corn, after the processing requirements, multiply by 0.3 [best case for corn] as the net gain. Others claim that the real multiplier is more like 0.1 or 0.2, and some even argue that the multiplier is 0.0 - that ethanol energy is just hidden petroleum energy and it is only competitive due to subsidies.

 

[Evo]

This fits into this discussion.

With the model, they can make tiny changes to the timing of the opening of both valves and ultimately optimize how engines run on alternative fuels.

"The major issue right now is that we have all these vehicles on the road today that are 'flex fuel' vehicles," Shaver said. That just means the gas tanks won't corrode and are chemically compatible with alternative fuels like ethanol.

"Alternative fuels do not combust the same way as conventional fuels. So you can put ethanol in your engine, but your engine will not efficiently burn that," Shaver told LiveScience. "

http://www.livescience.com/technology/070510_green_engines.html

 

[BobG]

Just for perspective, didn't I hear that the use of ethanol was not based on performance, but other motives?

The push for E85 and flex fuel engines are definitely for other motives. I'd agree with the Consumer Reports article MeJennifer linked to when it comes to the flex fuel engines.

The choice of ethanol over gasoline in Indy cars may not be entirely because of increased power.

NASCAR uses leaded gasoline to provide the extra octane needed to increase performance in cars that have to adhere somewhat to stock specifications - i.e. they can modify the engines, but they can't design an entirely new engine to stick in their car. Given the possibility of increasing the octane of gasoline or using ethanol, Indy cars use ethanol. Considering the amount of time lost in the pits to refuel during a green flag and the strategic advantages of getting a few extra laps per tank, the choice of ethanol over gasoline in Indy cars suggests that the performance/fuel economy trade off of ethanol must have some advantages over gasoline.

It's a pretty big stretch to say the principles of racing at 200 mph apply to city driving and I consider claims that mileage performance is equal to or better than gasoline engines a little dubious until a few 100% ethanol engines actually hit the street, hence the 'roughly equivalent' comment in my other post. You definitely wouldn't have the 30 percent fewer miles per tankful that the flex fuel engines have.

My point was CNN's claim might not be totally off the mark unless they start mixing in comments about engines designed for 100% ethanol with flex fuel engines. There's a big difference between the two and I'm not even sure what the point of the flex fuel engines is. Flex fuel engines won't motivate gas stations to start selling ethanol if no one is actually willing to use ethanol in their flex fuel engines. In fact, the disadvantages to actually using ethanol in a flex fuel engine will probably just make the obstacles for 100% ethanol engines even larger.

 

[Ivan Seeking]

The push for E85 and flex fuel engines are definitely for other motives. I'd agree with the Consumer Reports article MeJennifer linked to when it comes to the flex fuel engines.

I meant for Indy, not for the public. My understanding was that the switch was motivated entirely for environmental reasons [or even for the Indiana corn farmers?]. Or, perhaps this was some other form of auto racing that recently changed?

 

[Ivan Seeking]

The most important thing to realize is that we can't possibly grow enough corn, and even if we could, which we can't, food prices would go through the roof if ethanol became competitive.

For starters, sugar beets are a much better option for ethanol production.

 

[BobG]

I meant for Indy, not for the public. My understanding was that the switch was motivated entirely for environmental reasons [or even for the Indiana corn farmers?]. Or, perhaps this was some other form of auto racing that recently changed?

Indy racing changed from methanol to ethanol. They haven't used gasoline since the 60's. The switch reduced horsepower but increased fuel efficiency. http://www.fortwayne.com/mld/newssentinel/news/local/17206801.htm

 

[Ivan Seeking]

I want to add that I am not against the use of ethanol as a short term stop-gap solution as it could help in a crisis, and it is certainly great for the corn farmers, but the last thing that we want is a country or world covered with ethanol powered cars. In fact, for now and the foreseable future, it is not even possible.

 

[Aether]

Okay, I wasn't aware of the higher compression ratios possible, but since these cars are not available and the reality is what we actually have, ethanol probably offers no financial advantage.

Ethanol burns at about 107% the thermal efficiency of gasoline due to the higher allowable compression ratios.

And for anyone who want to do the calculation, when you see the 400 gallon per acre yields for corn, after the processing requirements, multiply by 0.3 [best case for corn] as the net gain. Others claim that the real multiplier is more like 0.1 or 0.2, and some even argue that the multiplier is 0.0 - that ethanol energy is just hidden petroleum energy and it is only competitive due to subsidies.

Per unit of energy output, corn ethanol production uses only about 8% of the petroleum input that gasoline production uses; it does use roughly as much fossil energy but mostly in the form of domestic coal and natural gas. The U.S. government is now investing heavily in the development of cellulosic ethanol production technology which could result in future ethanol production processes where virtually no net fossil energy is used for its production.

In order to replace petroleum with corn-ethanol, it would require about twice the land area of the US to grow the corn.

How do you figure this?

The land area of the U.S. is 3,537,418 sq mi (http://www.infoplease.com/ipa/A0108121.html) X 640 acres per mile X 400 gal. ethanol per acre (per year?) = 905,579,008,000 gal. ethanol per year.

In 2004, the United States consumed about 140 billion gallons of gasoline (http://genomicsgtl.energy.gov/biofuels/transportation.shtml )

So, it seems to me that only 0.225 X the land area of the U.S. would be required to replace gasoline with corn ethanol (assuming that 1.5 gallons of ethanol is required to replace 1 gallon of gasoline).

 

[Ivan Seeking]

I get that from a 0.3 multiplier for production efficiency [net gain of 120 gallons per acre], and including all oil products. Also, you have to include the reduced energy output from real cars and trucks. Diesel engines are 40% efficient at 139,000 BTUs per gallon.

I should have figured that someone would object to that one. I'll get some links up tonight.

And what we are going to do in the future doesn't count. I've been fed that line for thirty years now, and estimates are almost always far too optimistic. For example, one common [historical] fallacy was that nuclear power would be too cheap to meter.

 

[rcgldr]

The avantage of ethanol in a race car is you can use more of it, the fuel to air ratio can be 2.3 times that of gasoline. At this point you get more power from ethanol than gasoline (not milage wise, just peak power wise). Champ cars (and their predecessors, CART cars from the 90's), also use ethanol and turbo chargers. Nitro methane, as used in fuel dragsters, uses an even higher fuel to air ratio for extreme (but hazardous) power.

Regarding production of ethanol, it's better to use sugar cane. Brazil is currently doing this. Farmers in the USA quit growing sugar cane because it was cheaper to import than to grow it hear.

 

[Aether]

I get that from a 0.3 multiplier for production efficiency, and including all oil products.

Is the average ethanol yield 400 gallons per acre, or 0.3X400 gallons per acre? I think that you (or your sources) are mistaken about the petroleum input per gallon of ethanol, and that this error may be affecting your land-area calculation here.

Also, you have to include the reduced energy output from real cars and trucks.

Since it takes 1.5 gallons of ethanol to replace one gallon of gasoline, I have revised my previous estimate to read "0.225 X the land area of the U.S. would be required to replace gasoline with corn ethanol." This is due to the reduce lower heating value of the fuel, and not due to "reduced energy output from real cars and trucks".

I should have figured that someone would object to that one. I'll get some links up tonight.

Okay.