It could be that Google's coordinates are already in the WGS84 (gps) coordinate system. Typically map data in the US is in NAD27 coordinates.

In the parse_google.py file, there is a function 'decodePolyline'. It contains a line where we convert from NAD27toWGS84 which might not be necessary if they already did the conversion for us. The difference between the two coordinate systems tends to be about 200 meters.

You could replace coord=NAD27toWGS84(Coord(lat*SCALE,lon*SCALE)) with coord=Coord(lat*SCALE,lon*SCALE) and see if that does the trick.