Larry:
** It would make sense to me to have them leaned out as much as possible.**
No, you want BSFC(min) for max engine efficiency. That would be at about 15-20 LOP at the reduced power you would want for best L/D for the airframe. That will give you max range. Leaning further will actually decrease the range as the engine will be less efficient. BSFC => Brake Specific Fuel Consumption => pounds of fuel required to produce one HP per hour => efficiency. You want to be producing the most HP per pound of fuel possible.
Max range is found at BSFC(min) and best L/D airspeed.
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Walter Atkinson
Advanced Pilot Seminars
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