It's headed back to college where e85 sources are somewhat limited, so instead of struggling with sourcing, will likely leave it on 93 for a few months to ensure it is sorted. Figured I'd run at least water reducer through it for the next 4 or 5 fill-ups.
So the winner is - 22-24%...bad gas (for supposedly e85). So far, the good news is after draining the fuel and about 15 miles of driving, all seems to be returning to normal.
Again, the best answer found for draining the tank was disconnecting the fuel rail on the passenger side, and if...
All - thanks for the quick and valuable feedback. Right now we're going the route of disconnecting the fuel rail, having Lund send us a "pump on" tune and seeing what we get. We have a fuel/octane test kit we're getting ready to test with - and will update this thread for future search...
Really long story short, I believe I have a bad batch of E85. Shortly after filling up at the normal station, the car sputtered and died, and refused to restart. Prior to it dying completely, the NGauge registered several cylinder misfires, etc. Given that nothing else has changed, I'm keen...