I have done all of 66 in MO and if he needs any help or must see's let me know, alot of beautiful country and interesting stops to see, alot of it is getting marked by the MO 66 society but he will need a 66 map as much of the ol' 66 is broken and shifts from one side of 44 to the other and is a little hard to find without a 66 map. Definetly hit Kansas as it a short but a excellent trip as Baxter Springs was the idea for Radiator Springs in the Cars movies, Galena has "Cars on the Route"a Kanotex station with the real 'Mater that Towmater in the movie was based on. Alot of theold wests outlaws hid out in this part of KS as they could skip into MO or even Indian Territory (now OK) to elude the law (all within mere miles), including the James gang, the Youngers, Belle Star and the Dalton gang and many museums tell their stories, and don't forget Bonnie & Clyde where their later as the house they shot up in Joplin is still there to see where they killed 2 police and left their famous pic's for the media as well as Mickey Mantles home in Commerce OK.

Can't help but tell this story, in the mid eighties my brother & I worked at a Conoco full service station, a guy with a 60's mustang came in said fill it up and my brother put about 18 gallons in the car, he came back out and questioned that much fuel when it held about 14 gallons, my brother showed him the pump, he said "whatever" and opened the door and gasoline fumes poured out! It seems as though his rear window leaked and he decided to drain the water and drilled a decent sized hole in the trunk floor, which on a mustang is the top of the gas tank, therefore the fuel when filled up poured into the car, he hopped in with gas everywhere and actually drove away!
Sounds like a lot of fun!!!