Update... made it to Wisconsin Sunday evening without a problem. Man does she drink the oil though - I've put at least 6 quarts in since we left Virginia over 3400 miles ago. Interestingly I've noticed the burn mostly occurs when driving at high speed, which in most cases were 75 MPH zones in Kansas, Colorado, Utah, and Nebraska. Driving in and around Moab, in the city, and in 65 MPH zones in the other states resulted in little to no oil burn.

Here's an updated map. We stopped in Colorado Springs on the way to Wisconsin so Mahalia could see a dinosaur museum (and the girls could take a break from all the riding).