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If you are happy with the file your programmer made to convert your CSV into an XML feed, than all you really need to do is setup a CRON job to run on your server at a pre-defined interval to process the file every day.  What type of hosting environment are you on?  If you using CPANEL you can setup cron jobs to fire and run any file you need very easily with (link to tutorial on cpanel cron jobs)

A couple other thoughts, you most likely will need to make a cron to pull the vehicle pictures from the homenet feed so you can download them locally, crop them to fit the size you want and then display on your site.  I know from experience that if you hotlink directly to the images in vauto or homenet feed files they will not be very happy with you...

If this doesn't help post a little more info about your WP theme and the exact needs of your project, I would be happy to try and give you more helpful advice.

Also this is my first post on this site, so wanted to say hi to the community.