"Jeff" wrote:
The gamiJectors say you can run lean of peak, but when I tried it, I
seemed to lose some airspeed,...

Which you should. LOP is for fuel efficiency and cool CHT's; it does not
produce peak power.

... so I lean to 12 gph which is just a
tiny bit ROP, that seems to be the best mixture setting for me.

That's close to peak power.
--
Dan
C172RG at BFM