Hartzell 3 blade, 9:1, CAS, 1 Surefly, 1 Slick Mag Showplanes Cowl.
KTAS 177 @9000 12.5GPH ROP 2300/24.5 is my Fast cruise
KTAS 165 @9000 10.5GPH LOP 2300/24.5 economy cruise.
It'll go faster but I haven't done much real flat out flying so not a lot of data.
Thats mid weight, say two people and bags, full fuel. Its reliably 1-2 quicker solo and half tanks, and 1-2 slower at gross.
I gave a lot of thought to minimising drag.
I have a plenum
tight cowl/spinner gap (1/8)
two blade antennas - one a combined com/gps, nothing else external.
I'd assumed the 3blade would cost me performance, but Im comfortably seeing book numbers - if not slightly better - so I'm happy.
climb performance - especially light - is remarkable. Leaves my RV7 for dead.