The URL + content of the WebAPI XML stats you can retrieve has changed a bit.
The new URL would be: http://whatpulse.org/api/user.php?UserID=1 - this holds the same information, only the miles are added. This way is also only cached for 1 hour, instead of the 6 on the old URL.
Generation of the stats used to sometimes stop, when the memory of the server run out, because all XML files are generated at the same time. With this new script, that can't happen as well.
The old files will be around for a while, so there's no hurry in modifying your scripts. (unless you really really want your miles ;-) ).