[ARCHIVED THREAD] - Using E-85 Flex fuel

Posted: 7/5/2016 1:23:41 PM EDT

I just got a 2013 F-150 w/ 5.0 flex last month. I see that E-85 is $0.20 cheaper in town than the normal 10% or less gas, and curious as to the effects. Does it maintain the same fuel economy or become doggish and mileage go to shit?

Posted: 7/5/2016 1:30:25 PM EDT

[#1]

It will run great but get worse gas mileage. Over all it ended up costing me more money when I tried it.

Posted: 7/5/2016 2:05:55 PM EDT

[#2]

E85 is a joke. You should be able to find on-line what your mileage will drop to with E85 and then do the math to see if it's worth it for you. I doubt it.

Posted: 7/5/2016 3:32:07 PM EDT

[#3]

Stoich for E85 is like 9.5-10.5 to 1. A really rich mixture for gasoline is an extremely lean mixture for E85. That is where your mileage goes.

Posted: 7/5/2016 5:59:41 PM EDT

[#4]

It's funny how the ecoboost 3.5 isn't E85 ready.
That setup could actually make a ton more power (still with the drop in mileage though) with E85.

The 5.0, not so much.

Posted: 7/5/2016 8:59:13 PM EDT

[#5]

I used E85 2x enough to run a full tank of pretty much all E85

on E10 the E250 (2010 with the 4.6 V8) van i drove got 13mpg on the about 1/2 E10 1/2 E85 I got 11 mpg on the full E85 tank it dropped to 9 mpg

So you do the math

The best bang for your buck is pure gas

look here for a station near you

Posted: 7/5/2016 10:30:43 PM EDT

[#6]

I put some…once…in my 2013 Sierra. Though it wasn't a full mix (gas where I lived was 40¢ less than where I was so save a few bucks to top off with E85) but just enough to top off (3/4 of a tank was all I needed for the return trip on E10). Finding real gas is getting harder to do, especially if you drive a lot.

Posted: 7/5/2016 11:05:39 PM EDT

[#7]

As mentioned, mileage will drop. Not real benefit to running it in a non-turbocharged car. My wrx and ecoboost love it. Higher octane rating and lowers intake temps which is great for boost.

Posted: 7/5/2016 11:32:27 PM EDT

[#8]

It's been a while since I figured it out, but the break even point for my tundra was E 85 needed to be close to 50 cents cheaper.

Posted: 7/6/2016 1:12:11 AM EDT

[#9]

On my truck it's about a 20% hit on mpg and in my AO it's about 30% cheaper than gas so... Right now it works out for me. Your mileage may vary.

Posted: 7/6/2016 2:26:42 AM EDT

[#10]

My 2014 f150 5.0 lost roughly 3 MPG going from regular 87 octane to e85. Not worth it for $0.20 /gal but the 5.0 does run better with e85. I stick with 87 octane and e85 to clean out the fuel system every once in awhile.

Posted: 7/6/2016 7:40:01 AM EDT

[#11]

Its only 20 cents cheaper a gallon here, so the 20% + drop in economy isnt worth it.

E-85 makes a great race fuel though...

Posted: 7/6/2016 10:07:03 AM EDT

[#12]

Might be a good option if you're trying to pull a close to pull a heavy load with a half ton though.

[ARCHIVED THREAD] - Using E-85 Flex fuel

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[ARCHIVED THREAD] - Using E-85 Flex fuel

[ARCHIVED THREAD] - Using E-85 Flex fuel