I got a 45. Amazing. We have tons of sidewalks, and the following within 1 mile:
15 restaurants and bars
2 bike shops
3 coffee shops
2 public libraries
half dozen or so parks
elementary school
middle school
high school
2 grocery stores
1 hardware store
1 university
What else do you need? I think that the software must assume some minimum acceptable walking distances. Must be low like 0.25 mile or something. I think 2 miles would be more like it. Heck, my 4 and 6 year olds walk two miles round trip to the ice cream store.
I think that this would be a good tool for prospective homebuyers/movers if it were much more accurate.