At a constant %power/constant fuel flow I get higher TAS at higher RPM, which seems counterintuitive. For example, at 10,000 ft and 60% power/11 gph my TAS is 172 kt at 2200 RPM and 175 kt at 2500 RPM. Similar result at 5,000 ft. I conclude that one should cruise at high RPM...have others found similar results?