Have anyone ever calculated the fuel savings achieved by leaning rather agresively and compared them to the extra cost of actually having to fly 10 to 15% more time to get to the destination? Makes me think if it isnt better just to haul ass at full rich and get there asap (75%MCP).
I'm going to assume the increased engine wear will outweigh the benefit of actually having flown more NM from TBO to TBO.