e85 fuel is fairly available to me. I've never used it before (my truck is flex fuel), but 'they' say it gets 10% less fuel economy but has an octane rating of 100-105. With a tune, are you able to make up that 10% loss since you can tune for the higher octane? how much more power do you think you can tune for between an 87/91 gas tune vs the 100-105 e85 tune?

 

i doubt you can make up the 10% but unless your boosted or run alot of nitrous id stick with 91..on my cammed 6.0 i run 28 degrees with 91 octane and i dont get any knock and it wont make any more power with more timing

 

I am with dirt track racer, I cant see it being possible to make up the 10% with timing. You will reach a point where more timing might not mean KR but it wont give you any gains so its pointless to keep adding it.

 

Actually, E-85 has 30% less energy per gal, then reg gas. But because it is higher octane, and your truck is flex fuel, it has timing tables for the E-85 that have more timing in them which intern makes you have about 5% more power and helps get the econ loss up from 30% to the "real world" 10-15% less people see. If I had access to it, and it was priced correctly (not gouged like most is) should be about 50-60c less then reg, I would definitely run it as your price per mile would be less. And your not supporting overseas oil company's. But that just me.

 

e-85 isnt worth it if you dont have the compression to back it up