Route 66 is really an over rated cliche.The more northern route through Iowa,Nebraska,Colorado,Utah and Nevada provides some of the most spectacular and typically expected scenery that the States has to offer.I also took enough time to fit in the Golden Gate Bridge,Pacific Coast Highway and Yosemite and Mammoth in the Sierra Nevada and the ■■■■■■■■■■■■ then ran back to LA for the flight home.I did all that in one 6 week holiday including using the QE2 to NY.
Also did another trip from NY to Key West then back North to Niagara and Toronto via West Virginia and then back to NY then used the QE 2 home.Also remember the car hire reception not believing the respective mileages when they saw them. 
On that note it’s better to go for as long as possible and fit in as much as possible.Rather than going for numerous short trips and/or concentrating on any particular theme like just doing Route 66 which will always mean having to compromise what you can fit in and see during any of them. 
