Going overboard?

Hey all, I am doing some maintenance on my Gen 3 Prius IV, with 162K miles on it. The engine bay is super dirty, mostly because of a valve cover gasket leak that I am fixing. Here's a list of what I'm doing:

1. New Plugs/Coils
2. Valve Cover Gasket
3. EGR valve cleaning, Throttle Body cleaning, Intake Manifold and Intake cleaning
4. EGR cooler/tube cleaning
5. PCV replacement
6. Oil Catch Can Install
7. Fuel injector cleaning - I bought a tool on Amazon to clean them after you remove them.
8. Struts? - I'm not sure if I need to do this or not. This Prius IV is louder than my other Gen 3 Prius I as far as tire noise.
9. New weatherstripping/window seals
10. Sound absorption spray under wheel wells.
11. Sound absorption panels in doors.
12. Transmission fluid
13. Coolant and Inverter Coolant

None of this is due to poor performance, but I'd like to get the best MPG and have the car last as long as possible. I feel like I may have taken on too many improvements. I'm following some of the other posts in this thread but would appreciate your thougths. Thanks!
Ben