After a bit of research, I am debating between three routes for a round trip drive from Baltimore, MD to Oklahoma City, OK. The Northern Route is US 40 to St. Louis then Int. 44 to OK. The middle route is US 50 to St. Lewis then again Int 44. The Southern Route is Int 81 to Knoxville TN then on Int 40 to OK. The trip will be in late April. I can pick two routes - one there and one back, however my plan was to take 4-5 days to get out there, then get back as quick as possible (2 days). I was leaning towards the southern route but it is possible that next year I will be moving to Georgia and doing the Int 81 route a few times a year.....???