Map and Gas

I have been thinking about looking for some kind of map, whether paper or digital, that would make it easier to keep track of any/all locations...
D and I have talked about, at least to start, keeping things connected to trips already being taken, to save gas, etc. If one or more of us is going to be in the area, then maybe look for something along the way, etc. OR, possibly, combining multiple locations into one trip's worth of gas...