Adjust city border - too large

Hi James,

The area for my city is HUUUUUUGE. To run some of these streets I would have to drive for an hour to even begin. Is there any way the borders could be brought in, particulary the southern boundary. I understand the data is taken from OSM, but the borders on there seem to be much tighter there:

Thank you for looking into this, and I am loving the site - it has got me out of my neighbourhood and exploring all the crazy stuff in my city