Assuming you're talking vacuum ranges and not in boost?
If so, just keep leaning it out till you hit "lean surge".
Then just add a tad more fuel just to get rid of the lean surge.
This'll depend on how much of the lean surge you can tolerate.
Most people get annoyed with any hint of lean surge.
At the lower RPM ranges, EGT isn't much of a concern.
EGT's start to get really hot once you get north of 4k RPM's.
-Ted
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