"Tight" Route: A Definition?

[MOturkey]

Seems someone is always mentioning developing and maintaining a "tight" route. I can see where there might be a considerable difference in what constitutes a tight route from one location to another. Someone servicing primarily residentials in housing developments in the suburbs would likely define it differently than someone servicing property in a more rural area, or the inner city.

I'm just curious what some of you who have been in the business for some time, and consider yourself successful, call a tight route. I'd also think it would be more important to those running crews than for a solo operator such as myself, simply because of wasted man-hours. What is the ratio of miles to accounts serviced in your particular case? Thanks.