For comparison, I tried a couple former addresses.
My New Stanton house got a 3. No wonder: At the time I owned four cars, and I got the bike out maybe 3 times in 8 years.
My Monroeville apartment (Deauville Park on Northern Pike) got a 49, but they count places on US22 and PA48, and I guarantee you, you can't walk there. At all.
For salty's benefit, I tried a random house on his McCandless street, and got an 11.
I briefly lived at the corner of Filmore and South Neville in Oakland. That scored an 89.
I'll stand by my 55. I do walk all over, even w/o sidewalks. As to taxes, mine are triple what they were in New Stanton, but that's more than made up for by having one car, not four.