Sue, I just took my VX to Wisconsin and back this summer (and took a detour through Michigan for the Borbets) and burned about 2-3 quarts on the complete round trip. I was at about 55K-ish at that time though. I believe the trip was around 3K miles give or take, so I would probably plan on taking 5 quarts, since you could always buy more on the trip if you need.

I think as long as you check the oil each morning before you set out, at each stop, and at night before you head into the hotel you should be fine. If anything happens, well, I guess you just have to chalk it up as inevitable/fate.