The custom tune on my '08 F150 for 91 octane yields about 1mpg improvement with equivalent drivability compared to the 87 octane tune. I'm wondering if a 93 octane tune would be an improvement over the 91 octane or better yet a custom tune for E85. E85 at today's gas prices is about 33% cheaper than 91. Considering that's what I've read that you need for a spread to break even, I figure that since it burns at about 105 octane it may improve performance somewhat further.

Has anyone else considered a tune for E85 or just run the 93 octane tune on E85?

Joe

 

e 85= less cost,less power ,less mpg-it's a wash

 

Agreed. Justin is doing some research on it here shortly so all of us can have some information.

 

you need some 105 race fuel not 105 E85

 

E-85 = Less Cost, More Power, similar fuel economy. 61,000 miles and counting since converting my 2004 F150 to run exclusively on E-85 and 149,600 total on the truck. Now, I am looking at turning it into Bi-Fuel using LPI.

 

how do you get more power from e 85 when it has less btu content then?

 

I'm going to go back on what I did say earlier. I'm not sure what I was thinking. If I was agreeing it being a wash or whatever or simply didn't know. I do believe that E-85 is able to achieve higher power numbers. I believe there are a few vehicles running E-85 that are running some insane power numbers as well as 1/4 mile times. I swear I remember hearing about a car Roush had a hand in that was being ran with E-85. I'm still not exactly sure, I can't remember exactly what magazine had a huge article in it, it was a 'stang magazine, not too long ago. Who knows, I'm just ranting.