e85 for us has been extremely easy to tune with on the turdbo car... 22psi hot laps.. no KR at all.
But C16 like you said has more pluses over e85... just much more $$ to get... and gotta get 55 gallon drum and stick it somewhere, ect ect.
Once I finally have a car back ill really have to evaluate it...
Turbo Cars are way easier to tune with much cooler air charge.
I'm talking about S/C with no IC and a tiny pulley.