If you are going use additive with every oil change, that is about the same as using 2 quarts of oil every 1000 miles.I have used this in oil using engines in the past with some success:
You add it at every oil change. You could also try going to a higher viscosity oil such as 10W40 or 20W50 to slow the usage.
The 2009+ is a different engine, 2.5l vs 2.4l. I've no idea if the existing electronics would work with the newer engine. Even if it did the overall expense would likely exceed the value of the vehicle.
I had a car years ago that used 1 quart every 800 miles. Some of the older cars may even use more. I went to a single weight oil during the summer months only, and just checked and added oil every week. Much cheaper than an engine job or a new engine at more than $1000.