I did something similar but we took 10 weeks and took the Northern route to include Route 66. Here are my thoughts
3 weeks, that's a long way to drive
Have you considered rental car drop off fees as you are doing a 1 way rental
If you use hotels then join the frequent stay programme, we did Choice Hotels which includes lots of the not quite so budget hotels. Every stay gets points and we used the points to get a room for free in expensive cities
Choose a hotel that gives free breakfast to save on costs
Use supermarket for lunch
The park pass is $80 but if you are going to visit a lot of parks it will save you lost of money
September it will be quite warm
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