I've got a good portion of New England download, it really depends on the zoom level you are looking for. Normally I download the upper level maps for the bulk of my drive and download the more detail maps when I get closer to my destination and that saves a ton space right there. If you know your destinations ahead of time this is more then acceptable. If you're a traveling sales person maybe not so much since you don't always know you destinations ahead of time, but finding hotspots now a days is fairly easy. The other thing you can do is get a decent cell phone with bluetooth and a data plan so that you can down load maps and routes on the fly which solves the latter.