I took the liberty of trying this for you in MS FS2004. AND before I get berated, Cessna certified the MS simulated model so there!
Here's what I found:
At a medium gross weight (with 50% fuel and two front passengers weighing 90Kg each), at 2,500ft, and 2,300rpm I needed a tad above half way throttle to stabilise at 95KTS. An educated guess would be around 60-65% power for that altitude.
Other readings:
Manifold Pressure = 17 in.hg
Fuel Flow = 9 GAL/hour