I have a very low time 1979 P28A/181 Archer II, mint condition, that I have seriously upgraded avionics-wise last two years. Includes GTN 650, ADS-B, S-Tec 30 Autopilot w/altitude hold, new CDIs, the works. I am IFR qualified and everything works great! I have an acquaintance who is beginning his IFR training in his own non-IFR capable C172. Instructor usually spends first 20 air hours or so with simply honing basics of flying, before going on to more complex maneuvers requiring any sophisticated instrumentation. Acquaintance has asked if he can use my plane when it's time to start learning what is beyond his C172's capability. He's checked out in my plane for VFR flights. My question is what's a reasonable hourly rate to charge? Nearest big flight school charges about $120/hr wet. I don't want to be a jerk and charge an arm & leg, but I have dropped some serious coin in recent upgrades. Any suggestions? Thanks in advance.