[Piotrsko]

Econo cruise in a plane shouldn't burn a piston, not paying attention during full power climb will. Older Bonanzas were time limited on full power climb, not current an brand new ones.

At altitude in cruise you throttle back some amount then lean the engine until it misses or shuts down then add fuel until it runs smooth again. If you run full throttle you dont lean much but use the same process. If youre really into fuel economy, you have an exhaust temp gauge and you set the mixture to 50 degrees rich of peak temperature.