How does one tune for maximum mileage? I saw on a previous page that Hotroddave40 used the smallest jets and largest metering rods he could find. I have a different carb, so this advice may or may not work.

I've heard in the past that an excessively lean mixture will burn hotter, possibly causing overheating and/or burnt valves. So my question is, How can one know when the engine is tuned as lean as possible without doing any damage to the engine? Ideally, I'd like to know how to reach this point without using an oxygen sensor to measure the air/fuel ratio.