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#4378913 - 04/13/17 08:18 PM Do not buy E85 !
travlnman Offline

Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
That is, do not buy E85 for your FlexFuel vehicle, unless you have a nearby steady supply of E85 to feed your new habit. Of course, I'm speaking strictly for myself and my '14 F150 with 3.7L V6. I tried E85 as an experiment...a goof maybe...but the joke was on me. My truck absolutely loves it, and runs with a whole different personality. Throttle response is up, trans shifts's truly like a different vehicle. Even going back to 93 octane gasoline is not enough to make the same difference. My problem, in a nutshell, is that the nearest station I can get it is 1.5 hrs away. Fortunately, my work takes me past it often...but not often enough.Now, admittedly I am running a 5Star 87 octane performance tune, so that may allow the truck to better take advantage of these benefits. Yes, I lose a hand calculated 3mpg ( I calculate every tank of every type of fuel), however, when comparing to the next best option of 93 octane, the price break is $1 a gallon ($2.03 E85 vs $3.09 for 93) I'll take that loss. All political aspects/opinions aside and speaking strictly from a performance standpoint, I wish more stations carried it....moral of the story don't try it unless you can support the habit. Drive safe !

#4378922 - 04/13/17 08:25 PM Re: Do not buy E85 ! [Re: travlnman]
Rand Offline

Registered: 08/20/03
Posts: 12405
Loc: NE,Ohio
Anyway to get multiple tunes and switch back and forth?

I know a 93 octane tune is significantly better than an 87 octane tune.

and e85 is even higher octane.
2017 Jeep Cherokee Trailhawk V6

#4378932 - 04/13/17 08:33 PM Re: Do not buy E85 ! [Re: travlnman]
travlnman Offline

Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
I could buy other tunes, and re-flash each time...but seriously, it's more than enough of a difference for me...just wish I could buy it closer to home.

#4378945 - 04/13/17 08:45 PM Re: Do not buy E85 ! [Re: travlnman]
RichardS Offline

Registered: 01/14/17
Posts: 590
Loc: Melbourne, Florida
I toyed around with the idea of buying something flexfuel, but it seemed moot since the e85 here is rarely more than 20% less than 87, and I was told to expect about a 15-20% loss in mileage.
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

#4379059 - 04/13/17 11:06 PM Re: Do not buy E85 ! [Re: travlnman]
splinter Offline

Registered: 07/01/13
Posts: 1203
Loc: Dana Point, CA
My FFs are tuned for 91 and E85.

HPTuners and EFIlive are a hoot to play with.
M1 0W-40
T6 5W-40
PUP 5W-30

#4379063 - 04/13/17 11:12 PM Re: Do not buy E85 ! [Re: travlnman]
y_p_w Offline

Registered: 05/06/05
Posts: 3562
Loc: SF Bay Area
I know the energy content of E85 is supposed to be less, but it's supposed to be way more efficient when it can advance the timing. It's almost like 100 octane racing fuel.

The main issue I've heard with regards to performance boosts using E85 is that there isn't a terribly consistent proportion of gasoline. The more there is, the lower the performance benefit. And when you're doing comparisons it's really tough when there might be a difference in gasoline content.

#4379071 - 04/13/17 11:25 PM Re: Do not buy E85 ! [Re: travlnman]
oldhp Offline

Registered: 06/28/12
Posts: 1498
Loc: USA
E85 can be anything from 51% to 83% ethanol. Worthless to me. If it's so good, why do my tax dollars still subsidize it? mad

#4379078 - 04/13/17 11:34 PM Re: Do not buy E85 ! [Re: travlnman]
RationalRussian Offline

Registered: 06/29/15
Posts: 47
Loc: California
E85 is supposed to be around 105 octane. I love it in boosted applications.
95 Mazda Miata 208k 10-40w Maxlife/Ultra
03 Mitsubishi Built Evo on E85 Brad Penn 20-50w/RP
99 Jeep GC Limited 150k T6/Ultra

#4379140 - 04/14/17 02:07 AM Re: Do not buy E85 ! [Re: Rand]
Merkava_4 Offline

Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Rand
and e85 is even higher octane.

e85 is higher octane than 93 ?

#4379156 - 04/14/17 03:25 AM Re: Do not buy E85 ! [Re: Merkava_4]
rooflessVW Offline

Registered: 12/24/11
Posts: 3477
Loc: North Carolina
Originally Posted By: Merkava_4
Originally Posted By: Rand
and e85 is even higher octane.

e85 is higher octane than 93 ?

Yes. E85 is typically 100-105 octane.
"Zed's dead baby, Zed's dead."

#4379195 - 04/14/17 06:18 AM Re: Do not buy E85 ! [Re: travlnman]
Astro14 Offline

Registered: 10/10/10
Posts: 8268
Loc: Virginia Beach
Just filled up the Tundra with E85 on the PA Turnpike. An experiment.

Truck runs fine, it seems a bit more responsive. MPG is down a bit according to the trip computer.

But I'm certain that my experiment is costing me $$. The price of E85 here was $2.67. Same as regular. (Turnpike gouging) so, with the MPG hit, the E85 is at least as expensive as premium, which the truck doesn't require.

Further, I had to go inside and pre pay. I had to tell them, more than once, that my truck was flex fuel, before they would turn on the pump.

Too many morons had filled up regular cars from the big yellow pump, with the yellow nozzle and warning labels....
32 Packard 15W40
02 Volvo V70 T5 0W40 M1
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 TGMO

#4379202 - 04/14/17 06:40 AM Re: Do not buy E85 ! [Re: travlnman]
toneydoc Offline

Registered: 12/16/11
Posts: 1656
Loc: War Eagle
Maybe you purchase and use a storage tank so that you have a supply at the house or on back of the truck. Then you can refill it when your travels take you there for work
1994 Jeep 157k Mobil 5000 5w30
2014 Camry 29k Mobil 5000 5w30
2010 Sebring 47k Autozone syn 10w30
2014 HD Ultra 33k Mobil1 15w50
2012 Rav4 33k PP 5w20

#4379285 - 04/14/17 08:49 AM Re: Do not buy E85 ! [Re: travlnman]
y_p_w Offline

Registered: 05/06/05
Posts: 3562
Loc: SF Bay Area
I suppose the one thing about these flex fuel vehicles is that they're designed to actually take advantage of higher octane rated fuels. Has anyone here tried something like 100 octane street legal race gas?

#4379370 - 04/14/17 10:30 AM Re: Do not buy E85 ! [Re: travlnman]
kwijibo Offline

Registered: 06/04/10
Posts: 99
Loc: MN
My 04 Explorer is flex fuel and I have run the E85 at times and noticed it will get up and go a little quicker with it but the gas mileage does take a hit. My owners manual states if I run the E85 all the time to change the oil at 3000 miles instead of 5000 miles, also the plugs have to be changed sooner. I also found out when I first bought it that if I was running 87 octane and topped off with the E85 there was a good chance of tripping a check engine light so it was recommended by the dealership to add at least a half tank or more when going from one fuel to the other.

#4379389 - 04/14/17 10:58 AM Re: Do not buy E85 ! [Re: travlnman]
travlnman Offline

Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
Have topped off from 3/4 tank completely empty(fuel light on) and fill up with E85. No issues with the changeover, or check engine lights. I'll have to read the manual closely, but don't remember any stipulations about OCI or spark plug changes. Simply put , the more alcohol the better it runs. Yes, you will get less mpg, but as stated before, the price break for me,even over regular(87) is nearly $.40 per gallon, $1 vs premium (93). I've read of similar results , especially in boosted applications, it was merely an experiment on my behalf to confirm/deny the stated results (confirmed in my opinion)and share my results. I will now test a little further...allow me to explain. I'm curious if it's strictly due to increased octane or is there more to it ?? FlexFuel vehicles detect a change in exhaust oxygen content via the oxygen sensors and increase or decrease the injector pulse width(time)to inject more fuel for a given pulse (simplified version) Does it run cooler temps in the chamber, resulting in denser charge? Are there other components to it in addition to octane that result in increased performance ? When I have run couple tanks of just gasoline , I am going to run couple tanks of 93 octane, with an octane booster added to hopefully account for the increased octane only...and report back my findings. Totally unscientific , as I'm simply using my butt dyno and personal opinion...but I'll enjoy it...I hope you will too.

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