Wi-Fi Ranges

So, I was at the local sandwich shop last night, and I noticed I was able to
pick up a signal from a local T-Mobile hotspot, which I have an account
with. It was only one bar out of five. But I was able to connect to it and
surf the web without any problems.

I then looked up the hotspots in the area, and I saw that the closest one
was a Fed-Ex/Kinkos about 2-3 blocks away. Measuring it on the map, I
estimate it to be at least 800 feet from where I was.

Is that normal for wi-fi routers to have such a large range? That seems a
bit far to be picking up a wi-fi signal. The router was a little uphill from
me, though not a very steep hill.

Thanks,

Neil