Good suggestions, Scotty. Regular maintenance is key. But since no other codes were mentioned, nor misfires reported, I'm assuming that it's running OK. I would drive it with a scan tool (I use a OTC Genysis EVO) or some other data recording device to check for intermittent misfires and fuel trim issues. Those not withstanding, the only other possible contaminants are oil, coolant, silicone from gasket making material, or fuel additives. We might have to break this down to which engine has the most oil burning issues. The ones I've seen this with are the 3.8's, in Pacifica's and Caravans. Also PCV valve maintenance may come into play here. It would be great if some wiz on this forum came up with a way to chart it, using miles driven per quart, by engine type.
One thing that has impressed me has been the external sealing technology of modern engines. I've seen lots of newer Chrysler's (GM and Fords too) that match the sealing of import engines. Since my Pacifica (05, 3.8, 92,000 miles) is dry as a bone underneath, that quart I put in at 2000 miles had to go somewhere, and we all know where it was. Since I just bought it 2 months ago, I'm going to stay on top of it to monitor oil usage, maybe experiment with 5W30 synthetic to see what happens. It's not a VVT engine, so I'll probably be OK.