If you look on the side of the engine there will be a plate that says something along the lines of
"2300/65%. 2400/75%. 2500/80% 2700/100%"
I assume this is benchmarked to sea level at ISA.
My Lyc 180 with FP sweet spot for noise, speed, economy and hopefully engine longevity is 2350rpm leaned from just after take off up to cruise levels of about 2 to 3k then adjusting the RPM and mixture incrementally to suit higher alitudes, essentially using 65% power for everything other than TO and VX climb. I hate wasting gas.
Last edited by piperboy84; 27th Jul 2015 at 20:49.