IO,
I usually run about 46lph, LOP at 2200 RPM, WOT. Mine is normally aspirated, Saturday flew to EDNY and return on standard fuel, One hour plus remaining on landing. FL090 going and FL100 return. Dropped off my friend's A36TN to be fitted with TKS at Air-Plus (official TKS installer for this area). He flew at FL190, burning 15 US GPH and over 200 KTAS (go-far mode at 2200RPM). He burned more fuel than I did.
When retrofitting TKS to the BE36 you have a choice of FIKI or non-FIKI, the difference is in the paperwork, price and second fluid pump.