Reddit mentions of Porsche High-Performance Driving Handbook

There's a really good book by Vic Elford (former competitive driver who mostly drove Porsches) and he talks about the many things that typical drivers do wrong.

Like you pointed out, 10 and 2 is not only weak for providing steering effort, but it's also unstable. The weight of your arms atop the wheel instead of balanced at 9 and 3 means you'll have more see-sawing effect to control the car's motion. It also means you are pulling the wheel with your shoulders instead of pushing the wheel with opposing strong arm and chest muscles, benefiting from feedback from the tires and steering rack. Also, with any modern street-going vehicle with airbags, having your hands up high is a nice way to help break your arms/wrists if your airbag goes off. 9 and 3 or lower means the airbag will only push your hands away.

Another big one is the way people tend to tailgate before passing another car. He called this getting balked. When you run up on a slower moving car that you want to pass, if you get too close you not only have less visibility to see when you can pass, but also have to slow down more (and accelerate more) to actually execute the pass.

Good book and regardless of whether you drive a Porsche, there is a lot to learn. https://www.amazon.com/Porsche-High-Performance-Driving-Handbook-Elford/dp/0760327548/ref=sr_1_1