I agree on the saddle height. It’s important to have it high enough so you can push efficiently.
About the tires, I don’t agree 100%. Higher pressure might give you slightly better rolling resistance but will give you way more vibrations and shocks which makes you tired in the long run. I can poste a page of a book explaining this better if you like. In general it’s important to have smooth tires (usually high thread cound and good quality rubber) for a low rolling resistance.
It’s all in this book: https://www.renehersecycles.com/shop/print/books/the-all-road-bike-revolution/