[fiveohpatrol]

For that many miles, 1qt every 1000miles is not excessive by any means for a forged piston 5.0L

Can you visibly see any blue smoke while driving? If not, then have someone else drive your car, and you drive behind it to watch the tailpipes when they floor it, and when they let off. If it smokes when floored, then its most likely a piston ring issue, if it does it when slowing down (compression braking) then its either a valve guide or valvestem seal issue.

Also, if its smoking just for a few seconds when you start it, then a valvestem seal will cause this as well.

1qt every 1k miles can get annoying, but like i said, its not excessive for the miles you've got.