I'm not sure that I read that right!

Your asking if changing fuels will alter the efficiency of something that pumps air?

Also I have revese-converted pressure ratio to boost and found out that K03 can push max 1.92BAR @ efficiency 70%?? (please check image attached, pressure ratio around 2.9 & 159 CFM)

Conversion done this way:

PRESSURE = (14.7 + BOOST_PSI) / 14.7
PRESSURE * 14.7 = 14.7 + BOOST_PSI
BOOST_PSI = (PRESSURE * 14.7) - 14.7
BOOST_BAR = BOOST_PSI * 0.0689475728

Am I right?

firstly your on the surge line, secondly i dont think you stand a chance of getting a k03 on your engine into that effecency area, and why would you, its probably the least effecient part of the map.

If I understand map correctly then this point is at the 70 percent efficiency "island". Or am I wrong?

Yes it is 70% but that is assuming you can get the compressor to get there in the first place.

Yes, this is ignoring real life factors, I would log my actual boost and see deviation between requested and actual ant then fix this

Yes, I have used the s4wiki compressor map... Also, I'm not going over the surge line, keeping everything within ~70% of efficiency (except for very low rpm) but maxing out this island to the limits...
My main question still is unanswered. So E85 effects turbo possibilities or not? Those RPM lines were calculated using 1.8T engine size and, if I'm not mistaken, regular fuel. Wouldn't they be different for E85?

P.S>
Pr = (14.7 + Boost_in_psi) / 14.7 is the pressure ratio. What is this number 14.7? Stoich AFR?

if this is AFR then whole CFM formula should get different results for E85:
CFM = (L x RPM x VE x Pr) / 5660

Where L = engine capacity in liters
RPM = maximum engine speed (we'll adjust this later)
VE = engine volumetric efficiency.  From A. Graham Bell's book Forced Induction Performance Tuning some good values for VE are:
Stock 2-valve = 85%
Stock 4-valve = 90%
Street modified = 93%
Competition = 105%
Pr = pressure ratio