GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Running the GT on 10% Ethanol - Any ill effects?

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Old Apr 22, 2006 | 07:54 AM
  #1  
racerx's Avatar
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My area just recently switched from gas with MTBE additives to the 10% ethanol stuff, and I haven't filled up with it yet. Not that I have a choice now, but has anyone noticed any ill effects from running on 10% Ethanol?
I still have the stock tune on my '05.

Thanks!
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Old Apr 22, 2006 | 08:28 AM
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It shouldn't the ethanol just acts like a oxengenator like mtbe does. Now E85 which is 85% ethanol will cause problems
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Old Apr 22, 2006 | 10:31 AM
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From: E. Tennessee
10% has been at all gas stations around here in the last 5-10 years. No problems
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Old Apr 22, 2006 | 10:41 AM
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Good to hear, thanks guys!
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Old Apr 22, 2006 | 02:08 PM
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Should not be much of a difference in how the cars runs BUT when I switch between 100% gas and 10% blend I am sure the car runs better on 100% gas.
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Old Apr 22, 2006 | 09:12 PM
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Your car’s mileage (& performance) will drop slightly because there’s less energy content in a gallon of ethanol vs. gasoline. Technically gasoline contains 125,000 BTU/gal vs. 84,400 BTU/gal for ethanol, therefore less energy = less power.

Last year we had problems in Milwaukee with fuel injectors being clogged by sulfuric acid residue which was traed to ethanol producer’s tanks. We're also forced to use the stuff here too; however it keeps the farmers and ethanol producers happy.
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Old Apr 23, 2006 | 06:50 AM
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OK, so a 10% ethanol mix provides roughly 3.2% less BTU/gal compared to 100% gas. Wonder what could be added back to mixed fuel to regain the energy content?
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Old Apr 23, 2006 | 08:09 AM
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<div class='quotetop'>QUOTE(Silver Bullit @ April 22, 2006, 9:15 PM) Quoted post</div><div class='quotemain'>
Your car’s mileage (& performance) will drop slightly because there’s less energy content in a gallon of ethanol vs. gasoline. Technically gasoline contains 125,000 BTU/gal vs. 84,400 BTU/gal for ethanol, therefore less energy = less power.

Last year we had problems in Milwaukee with fuel injectors being clogged by sulfuric acid residue which was traed to ethanol producer’s tanks. We're also forced to use the stuff here too; however it keeps the farmers and ethanol producers happy.
[/b][/quote]

We have had some reports of some people's cars getting stalled after filling up at stations that just switched over to the 10% ethanol mix - they found a brownish liquid in their tanks. I wonder if it was the sulfuric acid residue?

I'm going to try to wait a few weeks before I put any of that stuff in the 'stang - and let them work out the distrubution problems - it was bad here this past week, about every 3 out of 4 stations I passed on the way to work had their pumps closed, it's a little better this weekend as more stations have gotten new shipments.

I just looked it up (90% gasoline + 10% ethanol) = 120,900 BTU/gal, that's a 3.28% decrease in power [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]
!@$!$!@$!$!
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Old Apr 23, 2006 | 12:40 PM
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In Southern Arizona, we just switched off the 10% blend. We are only regulated to use it between October and March. I got the GT in November, so it's all I have been running since I got it. Last weekend, I was able to fill it with 100% gas and I swear it felt like I had a whole new tune again. The 87 tune felt like the 91! More power, more torque, smoother idle, and about 10% more MPG.

Stoopid corn gas...[img]style_emoticons/<#EMO_DIR#>/mad.gif[/img]
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Old Apr 23, 2006 | 01:11 PM
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<div class='quotetop'>QUOTE(Silver Bullit @ April 22, 2006, 11:15 PM) Quoted post</div><div class='quotemain'>
Your car’s mileage (& performance) will drop slightly because there’s less energy content in a gallon of ethanol vs. gasoline. Technically gasoline contains 125,000 BTU/gal vs. 84,400 BTU/gal for ethanol, therefore less energy = less power.

Last year we had problems in Milwaukee with fuel injectors being clogged by sulfuric acid residue which was traed to ethanol producer’s tanks. We're also forced to use the stuff here too; however it keeps the farmers and ethanol producers happy.
[/b][/quote]

yeah, it sounds warm and fuzzy so it keeps the tree huggers happy...but mainly its a subsidy to big farmers.
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Old Apr 23, 2006 | 01:17 PM
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A 105 octane subsidy that puts food on the tables of American farmers instead of weapons in the hands of Islamic fundamentalists.

Of course it comes with drawbacks, but to write off ethanol as a useless subsidy program is to ignore one of the few promising options we actually have.
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Old Apr 23, 2006 | 03:48 PM
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Stations around her eswitched to the 90/10 about a month ago and I hate it. Car doesn't perform as well, and I have dropped about 50 miles per tank on my mileage.
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Old Apr 23, 2006 | 03:53 PM
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we go from 10% ethanol to 15% mtbe in the summer, its pretty much crap all year round lol
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