I have a Mopar Q-jet. The carb and intake came off an 80's non-computer controlled pick-up truck. I'm guessing the basic procedure for tuning for max mileage would be similar with other carbs also.(obviously the details would differ though)

Seems like I read years ago that the lean burn system Mopar used in the 1970's leaned the mixture out to a 16:1 or 17:1 ratio of air to gas. Is this approximately as lean a mixture which can be used and still maintian drivability? If drivability is acceptable, does this mean the mixture is not lean enough to harm the engine?