I fed mine a tank of no ethanol last week. No changes noted. Except it cost more.

 

The power it adds I feel is pretty noticeable l, mileage I can care less about, I bought a truck not a Prius. Ethanol 85 is cheaper here than standard unleaded, which I don't use anyways. Truck gets premium per the manual.

 

I know

 

which engine do you have?

 

Can you run the e85 in the 2.7?

 

I had a 93PRX tune on my '12 5.0, and would run pretty much all E85, 5 tanks of E85, and a tank of 93. At times I would change it up when the cost difference was less than .70 cents a gallon. I roughly figured the payback started at anything over a .70 delta. The worst mileage I got was around 12.5-12.7, but the power was very noticeable in combination with my tune. I'm planning on another 5.0 in a '20, and have lines on doing the same with it.
If it wasn't such a pain, and cost, I'd be running E85 in this 3.5.

 

No. Not in either Ecoboost engine stock.

Our work fleet is all flex fuel F150's and F250's. Several F250's have trouble switching back and forth between E85 and E10. We have starting issues in cold weather (10F or below). The trucks we have the issues on are now all E10 only and the problems have gone away.

 

I am on my 4th tank.
2016 FX4 5.0, 3.73 gears and 275/70/18 BFGs
I have a CAI and a Pedal Commander.
I can tell a big difference , but I went from 87octane to E-85
I only drive local in city traffic, so my mileage went from 14 to 9.5

 

I have 5.0. I have used E85 once but here in Vegas it's not worth it. I can get 91 at Costco for 3.13 and E85 is 2.85.
One thing I did to help keep things clean is a catch can.

 

I don’t really notice any difference other than the drop in mpg. You need to account for that when figuring out whether it makes sense to use e85.

If your mpg drops 20-25%, then E85 needs to be 20-25% cheaper than 87 octane.

Here in CA, that’s been easy. In America, that’s a more difficult proposition.