E15 in your gas tank?

[zebra]

i'm pretty sure i remember reading a study years back (before they started using E10) about it slowly degrading some of the seals & whatnot when i was looking at swapping my 91 explorer to straight ethanol. granted it'd be a much slower process when it's diluted that much. but still, you still have to burn more of it to get the same energy as you would straight gas. this is just me asking now - would there be a problem with potentially running a bit lean if, say, you just ran out of regular gas (out of town) and fill up with E15, and then as you're pulling onto the highway, the guy coming up behind you got the pedal stuck in his Prius so you... thinking more about protecting your kids in the back seat than remembering you have a pretty aggressive Nelson tune (for ethanol-free gas)... gun it to keep from being rear-ended then POW! goes a piston. quite extreme for most but there's a potential out there for this to be a probably situation, right?

[conekiller01]

i'm pretty sure i remember reading a study years back (before they started using E10) about it slowly degrading some of the seals & whatnot when i was looking at swapping my 91 explorer to straight ethanol. granted it'd be a much slower process when it's diluted that much. but still, you still have to burn more of it to get the same energy as you would straight gas. this is just me asking now - would there be a problem with potentially running a bit lean if, say, you just ran out of regular gas (out of town) and fill up with E15, and then as you're pulling onto the highway, the guy coming up behind you got the pedal stuck in his Prius so you... thinking more about protecting your kids in the back seat than remembering you have a pretty aggressive Nelson tune (for ethanol-free gas)... gun it to keep from being rear-ended then POW! goes a piston. quite extreme for most but there's a potential out there for this to be a probably situation, right?

Couldn't the tune compensate for the extra ethanol by adding a little bit of timing? Ideally ethanol is like 110 octane or something like that so maybe just more timin at WOT to keep from leaning out? And I'm not positive but I think Nelson leaves a little extra fuel just to prevent lean situations anyways but hey what do I know, I might still be drunk this morning anyways lol

[zebra]

pure ethanol is about the same as 108, yes. and i know Allen leaves some slop in there - i was creating a hypothetical situation to see if it could potentially be a concern with a really aggressive tune - especially on a boosted application when particulars matter more

[ChevyLee]

I just run e85