I have used this type of software before. THere ae lots on the maret that basically do the same thing. 10-15% reduction in fleet size is not un common. You did well at 20%. Must have been a very inefficient fleet
There are lots of different route scheduling software products around. You need to be careful about which one to select though. Whilst most have similar functionality, the real difference is in how they geo code the drop locations. Some are more accurate than others and some do not not operate wel in certain countries. In the UK for example, many wil geo code based on post codes, which in the UK narrow a location down to three buildings. In other countries a post code might represent a town!