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Welcome to the site.
All of that can certainly be done for some good gains. However, I'll chime in with some other dave, driving technique comes first and will likely show you your largest gain.
After driving technique I'd start with the easy good bang for little work mods like a grill block and other easy aeromods.
For heavy city driving, the hybridizing will help a lot, but it won't do squat for highway driving unless you swap in a smaller engine.
Your ideas are good, but complex and costly. I'm just letting you know there are better/easier ways to start off.
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