Tried E85 in my 09 F150 5.4L 4x4 super crew

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I needed gas (badly) and the FL turnpike stop had E85. It was $2.36 vs. $2.88. Not enough of a savings to fully justify the loss of BTU (and MPG), but not too far off. So, I went for it.

Glad I did. The Ford is rated at 320HP with E85 and 310 with gas. However, here in FL, the 310 is not accurate, (feels like 200HP) as the knock sensor is constantly pulling timing and the truck is slow and accelerates unevenly on regular gas.

The E85 makes this truck flat out fast. I can easily spin both rear tires (until the traction control kicks in) with the E85. On reg unleaded, the truck won't even think of spinning the tires.

I really enjoyed the new found power and my driving habits changed for the worse. However, my average MPG (on the dashboard liar) dropped to 11.2, not good. I generally see 14.4MPG around town on reg, and 16.7 on the highway. I tried some short highway runs and reset the MPG meter to see what E85 resulted in. About 13-14 on the highway going 65MPH. Whereas 16.7 going (I won't say how much) faster with gas.

Interestingly enough, the tailpipe is jet black inside. It was perfectly clean before. The E85 caused that.

I managed 326 miles on a nearly 35 gallon tank of E85. Not exactly good, but upon refill, I could not top off and check actual MPG, as my credit card is limited to 75 bucks and won't let me fill up. Gas will get me 450 miles per tank.

I enjoy the power and the way it runs on E85, but I probably won't do that often. It's not cost effective and I have to refuel more often.

BTW, premium unleaded does not produce the same power in my truck, though it does keep the knock sensor from yanking the timing and causing uneven acceleration that occurs on regular.
 
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you'll want to change your oil more often if you run E85 regularly.

I've heard turbo subaru's are rockets on this stuff.
 
It is really nice that there is the E85 option. Have you tried a full tank of the highest octane long enough to see what it does for the mpgs.
 
For some reason the manual for my eco 2.2 says not to use such practices. It does say that the computer automatically determines the mix in the tank and adjusts accordingly. But it also goes on to say that you should use either/or and not to switch back and forth between E85 and E10.

Does the Ford manual state the same for their flex vehicles? And does anybody know why you wouldnt want to switch back and forth or run a 50/50 mix? Why does the manual say not to do this?
 
....this is the wording from the manual...seems kind of contradictory to me.....

"To ensure quick starts in the wintertime, the E85 fuel
must be formulated properly for your climate according to
ASTM specification D 5798. If you have trouble starting
on E85, it could be because the E85 fuel is not properly
formulated for your climate. If this happens, switching to
gasoline or adding gasoline to the fuel tank can improve
starting. For good starting and heater efficiency below
32°F (0°C), the fuel mix in the fuel tank should contain
no more than 70% ethanol. It is best not to alternate
repeatedly between gasoline and E85. If you do switch
fuels, it is recommended that you add as much fuel as
possible—do not add less than three gallons (11 L)
when refueling. You should drive the vehicle immediately
after refueling for at least seven miles (11 km) to allow the
vehicle to adapt to the change in ethanol concentration."
 
Not unusual to get 20-25% worse mpg using it. Unless it is 25% less in price (which it isn't) it is not worth using.
 
Originally Posted By: webfors

I've heard turbo subaru's are rockets on this stuff.


Boosted anything are rockets on E85 because it's almost like race fuel - you can run so much more boost compared to premium pump gas.
 
I don't know where the manual is. Sorry, but when I find it, I'll look.

I did notice that it took some time to "adapt" to the E85.

I do remember that the manual mentions to use the "severe service" oil change interval if E85 is used more than half the time.
 
Originally Posted By: Captain_Klink
Imagine what a big party you could have thrown with all that ethanol, and instead you just burnt it all up.


lol.gif
 
I have been running a 50% ethanol mix in my cars for years, with “O” issues. In fact injector cleaner appears to be a thing of the past. My Mark VIII was running poorly and needed premium fuel. I started mixing a ½ tank of regular with a ½ tank of E85 = less total cost than regular. Cleaned the injectors right up and runs great.
I also run this mix in my 67 Ranchero as the 5.0 (89 Mustang engine) likes premium. My 2002 Lincoln Continental, 98 F-150 and sons 2006 Dakota all run great with no issues.
This spring I am converting our 1970 Mercury Cyclone 429CJ to E85. 105 octane for less than regular. All this talk about corrosion and etc seems to be a non-issue. I think people just assume that ethanol is like methanol and it’s not even close.
 
Originally Posted By: 44wjs
I have been running a 50% ethanol mix in my cars for years, with “O” issues. In fact injector cleaner appears to be a thing of the past. My Mark VIII was running poorly and needed premium fuel. I started mixing a ½ tank of regular with a ½ tank of E85 = less total cost than regular. Cleaned the injectors right up and runs great.
I also run this mix in my 67 Ranchero as the 5.0 (89 Mustang engine) likes premium. My 2002 Lincoln Continental, 98 F-150 and sons 2006 Dakota all run great with no issues.
This spring I am converting our 1970 Mercury Cyclone 429CJ to E85. 105 octane for less than regular. All this talk about corrosion and etc seems to be a non-issue. I think people just assume that ethanol is like methanol and it’s not even close.


It is corrosive.I have seen plenty of fuel systems replaced because of E85 corrosion
 
Originally Posted By: webfors
you'll want to change your oil more often if you run E85 regularly.

Why?
 
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