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Author Topic: Has anyone noticed a dffierence in fuel economy when using ethanol Back to Topics
CORNHICK

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Omaha

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Message Posted: May 1, 2012 8:38:24 AM

I am concered about percentages if you have lost fuel economy with using 10% ethanol and what kind of car. And whatever else tips you might have to tell me!
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twt
Champion Author Virginia Beach

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Message Posted: Jul 19, 2014 5:05:54 AM

Simple. Corn oil, doesn't burn as well as gasoline. Nuff said,
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StArrow68
Champion Author Oakland

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Message Posted: Jul 18, 2014 5:56:32 PM

Since we only get e10 in CA it is hard to compare but on a recent trip east I got two tanks of pure gas and that was the best mpg leg of the trip, 29.99 vs 28.5 for the whole trip.
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GrumpyCat
Champion Author Alabama

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Message Posted: Jul 18, 2014 3:04:07 PM

E10 usually doesn't make enough difference to notice but there are some local sources of E10 which result in noticeably poorer MPG. Quite possibly due to water content.

Pure gasoline will hold very very little water. Ethanol will mix with gasoline and carry water with it, up to a point. No matter what, water in the combustion chamber is bad. Normally with pure gasoline water never gets that far. Its easy to drain water out of gasoline but more expensive than the product is worth to remove water from E10.

Water and ethanol mixed together corrode metals and plastics worse than either alone.
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Skyjunky
All-Star Author Portland

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Message Posted: Jul 4, 2014 12:06:26 AM

Heck yes besides all the h2o that can get in the systems and the hoses IF they are gas lines will be brittle or slowly melt be cause of the ethanol
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PaylessKY
Champion Author Kentucky

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Message Posted: Jul 3, 2014 9:38:32 AM

We have been using ethanol for so long, I don't remember.
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badbobKY
Sophomore Author Lexington

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Message Posted: Jul 3, 2014 9:24:27 AM

don t use
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puddy
Champion Author Wisconsin

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Message Posted: Jul 3, 2014 8:32:48 AM

yes it is less using the fuel with ethanol in it
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cv
Champion Author Raleigh

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Message Posted: Jun 27, 2014 5:27:43 AM

Yes in my case, it seems like the mileage per gallon is less.
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badbobKY
Sophomore Author Lexington

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Message Posted: Jun 23, 2014 9:13:50 AM

no
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OilerFan
Champion Author Tulsa

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Message Posted: Jun 23, 2014 8:11:20 AM

yes. The ethanol mix consistently gives lower mileage in every vehicle I've used it in.
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forresj
Champion Author Wilmington

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Message Posted: Jun 23, 2014 7:52:58 AM

Ethanol does lower overall MPG because 10% ethanol in gasoline has a lower energy density than just 100% pure gasoline.

I drive a 2011 MAZDA 3 hatchback. I don't use any fuel system cleaning additives because ethanol in the gasoline is supposed to clean the engine. But I do use a gasoline stabilizer because I want to keep the gas fresh because I don't drive as much anymore.

[Edited by: forresj at 6/23/2014 7:56:19 AM EST]
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Jackson126
Veteran Author Virginia

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Message Posted: Jun 23, 2014 5:35:57 AM

Lowers my mpg
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carinthuist
Champion Author San Francisco

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Message Posted: Jun 20, 2014 12:36:45 AM

don't use it
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GLM4205
Champion Author Toledo

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Message Posted: Jun 19, 2014 5:40:00 PM

Yes it does lowers you MPG.
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poetdog73
Champion Author Toledo

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Message Posted: Jun 19, 2014 12:14:54 AM

don't use it!
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 18, 2014 10:32:07 PM

It drops off any time of the year.......
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dave43
Champion Author Iowa

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Message Posted: Jun 18, 2014 2:49:26 PM

YES Its goes down.
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mnrick041
Champion Author Twin Cities

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Message Posted: Jun 11, 2014 9:11:52 PM

I would not know since the ONLY fuel available in Minnesota is a Ethanol mix. I assume that if I went somewhere without Ethanol I might see a increase in my MPG's
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blupupher
Champion Author Houston

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Message Posted: May 12, 2014 10:59:39 PM

My Elantra would get around 10% worse mileage with e-10.
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dontuknowOH
Champion Author Ohio

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Message Posted: May 12, 2014 10:16:30 PM

I believe my engine stays cleaner in the combustion path areas and burns cleaner with the exhaust discharge.

There is a mileage drop off, the percentage varies with docile or pressed driving habits, seems the percentage increases when I press for performance of the cruise/manual go pedal speed against headwinds. Idling Summer and at moderate traffic speeds steady the mileage improves, but always much better before E-10 was added to the reg. 87 of past years.

My vehicle's ECM was reprogrammed when E-10 became the norm fuel at all pumps several years ago to correct exhaust sensor's range of temps, there was a malfunction code/CEL indicated correction free dealer reprogramming effort done.

I have DIYed under-hood projects to reduce engine restart and cold weather warm-up time of the engine/cabin temps mostly for Fall/Winter/early Spring. That can still be improved upon, mainly for Winter use/better mileage. A few more bucks involved for later.... No burn outs(interests)!
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dave43
Champion Author Iowa

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Message Posted: May 12, 2014 5:48:58 PM

yes It sucks.
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carinthuist
Champion Author San Francisco

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Message Posted: May 12, 2014 1:57:46 PM

no don't use ethanol
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Boyrr
Champion Author Allentown

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Message Posted: May 12, 2014 12:15:58 PM

for me, it's 1 - 2 mgg's less with the Ethanol
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dassfg
Champion Author Fort Worth

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Message Posted: May 12, 2014 7:52:58 AM

For fuel economy Go Diesel
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contiki
Champion Author Ontario

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Message Posted: May 12, 2014 6:48:59 AM

Never used ethanol....................
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Jmac2008
Champion Author Missouri

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Message Posted: May 12, 2014 1:19:42 AM

My Mileage goes down about 10% with 10% ethanol in the gasoline compared to no ethanol.
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GrumpyCat
Champion Author Alabama

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Message Posted: May 8, 2014 4:28:26 PM

carinthusist claims, "no don't use ethenol".

Sorry, but you can't get anything but in Kalifornia. All gasoline there has 10% ethanol but for E85 which will have 70% to 85% ethanol.
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CiVX
Champion Author Oakland

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Message Posted: May 5, 2014 12:44:36 PM

It should be less because alcohol has less energy density then gasoline.
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carinthuist
Champion Author San Francisco

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Message Posted: May 4, 2014 11:36:28 PM

no don't use ethenol
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Skyjunky
All-Star Author Portland

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Message Posted: May 4, 2014 8:38:05 PM

yes , on my older vehicles ethanol is crap rusts metal fuel lines and crack ethanol resistant lines and not good on engines. I have seen a drop in my MPG's when I did use ethanol and that is now why I use 92 oct NO ethanol LL in ALL my engines.
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Boyrr
Champion Author Allentown

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Message Posted: May 4, 2014 11:06:04 AM

my mileage is lower by 1 - 2 mpg's when I use gas blended with ethanol.
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Houckster
Champion Author Atlanta

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Message Posted: May 3, 2014 1:10:04 PM

I'm no fan of ethanol but when someone claims they've lost 4-5 MPG with E10, I'm more than a bit skeptical unless they have a high fuel efficiency car where 4-5 MPG is about 3-4% of their gas mileage. Either they've got an overly optimistic memory of what their mileage with gasoline was or they're not computing their E10 mileage correctly.

All things being equal, E10 should cost 3-4% of the mileage one gets with gasoline.
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Don20
Champion Author Oklahoma City

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Message Posted: May 3, 2014 10:54:15 AM

Yes, have lost 4-5 mpg less. Will continue to use all gas why take a chance when you don't know who to believe. Especially in this day and ago..
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NEtracker
Veteran Author Boston

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Message Posted: May 1, 2014 11:13:37 AM

E10, Lost 3-5 MPG
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46chief
Champion Author Indiana

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Message Posted: Apr 30, 2014 2:19:56 PM

Oh yeah! Lost 5-7 mpg. when I used ethanol.
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GrumpyCat
Champion Author Alabama

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Message Posted: Apr 30, 2014 1:49:44 PM

Yes.

Plus back in 2008 when my source of ethanol-free gasoline dried up my carbureted 2008 KTM 450 XCR-W dirtbike ran like crap. Due to EPA heavy-handedness it was marginally lean from the factory but when leaned further with ethanol it barely ran.

So out came the credit card for a $70 jetting kit to get it back into reasonable running tune.
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contiki
Champion Author Ontario

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Message Posted: Apr 16, 2014 7:21:08 AM

Never use ethanol............
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contiki
Champion Author Ontario

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Message Posted: Apr 14, 2014 7:40:32 AM

Never use it..........
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ScottAdams5
Champion Author New York

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Message Posted: Apr 14, 2014 6:10:38 AM

Yes. I've documented a 10% fuel economy decrease with ethanol blended fuels. Very expensive!
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deant99
Champion Author Ontario

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Message Posted: Apr 13, 2014 9:00:05 PM

won't use it
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gvan
Champion Author Chicago

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Message Posted: Apr 11, 2014 10:18:14 AM

"Over time, Ethanol will mess up an engine."

If your vehicle is 35+ years old there may be a problem with rubber fuel lines but no engine problems. There may be a slight decrease in mpg with E10.

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gemir21
Rookie Author Louisiana

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Message Posted: Apr 6, 2014 2:27:32 PM

I have noticed a difference in fuel economy using non-ethanol gas. I'll get anywhere from 50-75 more miles per tank with a 12 gallon tank.

[Edited by: gemir21 at 4/6/2014 2:28:29 PM EST]
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contiki
Champion Author Ontario

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Message Posted: Apr 6, 2014 7:21:33 AM

never use it...........
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cv
Champion Author Raleigh

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Message Posted: Apr 6, 2014 6:31:25 AM

Yeah, less miles to the gallon.
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rumbleseat
Champion Author Winnipeg

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Message Posted: Apr 5, 2014 11:09:34 PM

twt says: "Over time, Ethanol will mess up an engine."

Horse-pucky!
I have used E10 since 1981.
Nobody ever answers when I ask them to please tell me when I can expect engine damage.
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Houckster
Champion Author Atlanta

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Message Posted: Apr 5, 2014 2:00:17 PM

JIMMY544: My argument was based on the belief that the engine was trying to maintain an AFR of 14.7:1 as opposed to ethanol's ideal AFR of 14.08:1. Thus I said that the engine could tolerate E10 because it still runs "properly". What I've learned is that the engine's emission system will adjust the air:fuel ration to accommodate E10 and run at 14.08:1.

I hope my understanding is correct.
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jimmy544
Champion Author Boston

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Message Posted: Apr 5, 2014 12:39:45 PM

There is still a basic difference in BTU content between E10 and E0. It is sometimes hard to see this difference because many factors can affect fuel economy. But when it is factored in over many tankfuls and you use the same car and driver and only vary the gas; most of the other factors tend to fall out. I used to notice this effect when I lived in California and drove 30,000 miles a year or more. When you left Cal and drove in Nevada or Oregon or Idaho your mileage would pick up 3-5% over driving on the Cal gas.
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drydem
Sophomore Author Maryland

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Message Posted: Apr 5, 2014 8:48:28 AM

the drop in BTU ethanol blend gasoline is compounded when the ICE is required to acceleration - the less frequent and the more gentle u accelerate the less difference u will see in fuel efficiency. The more frequent and the harder u accelerate the greater difference u will see in fuel efficiency. Why? Force = mass * acceleration. Energy(work) = Force * distance. You can use less energy and go same distance for the same mass/weight if you use less acceleration. However this means going at a slower average speed.
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jimmy544
Champion Author Boston

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Message Posted: Apr 5, 2014 8:24:51 AM

Houkster:

You said most cars don't adjust themselves to E-10 they just tolerate it. This is true for carbureted cars but cars with Fuel Injection/Induction adjust the fuel/air mix constantly to maintain a good running and economical fuel burn. The O2 sensor develops a voltage that controls the mixture based on exhaust gases. Different cars have differing ability to deal with various gasolines. Some like the flex fuel vehicles can run on nearly pure ethanol.
The real difference in mileage is because there is about a 5% difference in BTU content in E10 vs. E0. There can be even less BTU in E10 if there is significant water absorbed into the ethanol. E10 is one reason why you don't see as many troubles with water condensate causing stalling/poor running conditions as much these days.
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twt
Champion Author Virginia Beach

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Message Posted: Apr 5, 2014 4:25:14 AM

Over time, Ethanol will mess up an engine.
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