Anyone on corn

[Harry12]

Just had a local gas station add an E85 pump. My 12 EL runs flex fuel so I have been saving the 70 cents a gallon and running E85. I seen a slight drop in mileage but not much. Does anyone know if the computer "learns" my driving habits and the switch to E85?

 

[toms89]

Yes the pcm recognizes when you run E85 and adjust tune for it. Different timing and air/fuel ratios used for each fuel or combination thereof.

 

[toms89]

Wish mine was flex fuel...

E85 is like a poor mans race gas in boosted applications. Can get much more aggressive with the tune and/or boost.

 

[01yellerCobra]

You won't get the same mpg with E85. It takes more volume to get the same heat. I think you have to get up around 13:1 compression to start getting the same mpg as gas.

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[Harry12]

Do you know what the difference is between fuels? I heard about 10% but I am seeing maybe 5% less.

 

[montecarlo31]

Do you know what the difference is between fuels? I heard about 10% but I am seeing maybe 5% less.

I am guessing you have a light blend of E85 at this point (probably in the 50% range or less). You will see a solid 20% difference once you get to the 70% plus concentration unless you have the one off engine that burns the same amount of E85 or 87. Most E85 blends actually come in under 85% ethanol. For what it's worth and I can't find it now but our ford rep sent a dyno chart of the 5.4L on a strong E85 blend and it made almost 400 ft lbs of torque (I think it was a 30 ft lb gain).

For what it's worth I average about 8-9.5 mpg on E85 and 11-12 mpg on 93. I've never run regular in the truck so I can't tell you where I would be on 87.

 

[Paul2003]

My truck isn't flex fuel but it doesn't matter as I have never seen a station that sells it. Not sure if it's available in Canada.

On the plus side I've heard the first corn on the cob of the season is available the weekend.