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Old 03-07-2013, 11:27 AM   #781
Bombadil
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Oak Ridge National Laboratory conducted a study on ethanol blended gasoline. The results were published in 2009. They used 16 different vehicles and tested at multiple sites (different elevations). Their summary findings were as follows:

Vs E0 gasoline

E10 was -3.68% with a plus/minus of 0.44%
E15 was -5.34% plus/minus 0.53%
E20 was -7.71% plus/minus 0.88%

That is, they found a predictable and linear correlation between the measured BTU content of the fuel and the real life measured gas mileage. None of the cars got better mileage with E10.

They also found statistically significant reductions in CO2 emissions from ethanol blends. CO2 dropped by 12% to 15%.
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Old 03-07-2013, 12:03 PM   #782
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Quote:
Originally Posted by Bombadil View Post
Oak Ridge National Laboratory conducted a study on ethanol blended gasoline. The results were published in 2009. They used 16 different vehicles and tested at multiple sites (different elevations). Their summary findings were as follows:

Vs E0 gasoline

E10 was -3.68% with a plus/minus of 0.44%
E20 was -5.34% plus/minus 0.53%
E30 was -7.71% plus/minus 0.88%

That is, they found a predictable and linear correlation between the measured BTU content of the fuel and the real life measured gas mileage. None of the cars got better mileage with E10.

They also found statistically significant reductions in CO2 emissions from ethanol blends. CO2 dropped by 12% to 15%.

The reduction in mileage with increased ethanol content makes sense but the chart is not what I'd expect. Based purely on energy content the mileage difference should be:

E10 = -3.4%
E20 = -6.8%
E30 = -10.2%

The values proved indicate that the reduction in mileage is less than expected above E10. It would be interesting to know what scientists would say to explain the deviation...


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Old 03-07-2013, 12:11 PM   #783
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OOPS!!!

You are correct!!!

I made an error in reporting their findings, I understood what they were saying but typed the wrong numbers in. I must have had E30 on my mind from the earlier post.

They tested E10, E15, and E20, not E10, E20, and E30. I will make those changes above.

Thanks for pointing this out.

Their report can be found here: http://feerc.ornl.gov/pdfs/pub_int_b...t1_updated.pdf
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Old 03-07-2013, 12:37 PM   #784
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The values proved indicate that the reduction in mileage is less than expected above E10. It would be interesting to know what scientists would say to explain the deviation...
A friend of mine has spent a lot of money in Detroit testing E30 and they are finding E30 has 100 octane characteristics which helps. Also, the more Eco-boost type technology we move towards, the better E30 looks as far as emissions and performance. When it comes to my friend's 2007 Camry, I bet the timing advance is max'd out when E30 is in the tank.
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Old 03-07-2013, 01:06 PM   #785
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I'll throw in some more info about octane/energy content. While not DI,or high compression, my friend has a 2007 Camry(4 banger) that makes a 25 mile trip to work and then back home four times a week plus going to the store. This is in a rural area so not much city. He reports that the mileage on E10/89octane is 31 mpg and when he uses E30/94 octane, the mileage is 29 mpg. The E30 is about 20 cents less so it is a wash for cost per mile. I told him that if it wouldn't be such a sin, he should try E0/87 octane and see if the mileage jumps to 35mpg or so, and see if you guys are right.
Your friend may want to check his manual: I doubt a 2007 Camry is designed to run on E30. Bad things can happen to plastic and other fuel system parts if too much ethanol (i.e. > 10%) is in the fuel.
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Old 03-07-2013, 01:14 PM   #786
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Your friend may want to check his manual: I doubt a 2007 Camry is designed to run on E30. Bad things can happen to plastic and other fuel system parts if too much ethanol (i.e. > 10%) is in the fuel.
You are right about the owners manual but reality sometimes is different. I had a hard time talking him into the E30 but after he thought about how I had been using E50 in my 1992 Toy 4x4 since 2001, he realized it shouldn't hurt it.
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Old 03-07-2013, 01:16 PM   #787
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Old 03-07-2013, 01:21 PM   #788
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I'm trying to post an image but it's not working. It's a graph using four different grades of gasoline mixed with different %'s of ethanol. For simplicity I'll describe E30. This is MON octane. 76.5 oct gas becomes 87. 82 goes up to 88. 84.5 goes up to 88.5. 86 goes up to 90. Remember MON is the lower of the two MON/RON.
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Old 03-07-2013, 01:48 PM   #789
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Your friend may want to check his manual: I doubt a 2007 Camry is designed to run on E30. Bad things can happen to plastic and other fuel system parts if too much ethanol (i.e. > 10%) is in the fuel.
Don't kid yourself, bad things can happen with E10. E10 destroyed a friend of mines Norton 850 Commando tank. It was made of fiberglass. He failed to realize what he was doing as E0 became near impossible to get and he inadvertantly put that crap in his tank.
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Old 03-07-2013, 01:53 PM   #790
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don't forget that prior to the 2013MY Fords, anything more than E10 will void your warranty unless you specifically have a flex fuel vehicle.

http://www.usatoday.com/story/news/n...-cars/1735793/

"BMW, Chrysler, Nissan, Toyota and VW have said their warranties will not cover fuel-related claims caused by E15. Ford, Honda, Kia, Mercedes-Benz and Volvo have said E15 use will void warranties, says Darbelnet, citing potential corrosive damage to fuel lines, gaskets and other engine components."
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