... 3) he couldn't run faster than before, but he could run LONG distances without tiring...
As I recall he could
run faster, beating the world and Olympics sprinting records, over short distances. As you say he could also keep on running over long distances at a steady speed (somewhere between 6-8 mph, I think) for as long as he was awake.
I also liked the little 'add ons' he was fitted with in the book. When infiltrating a sub base via the sea, for example, he had compressed air tanks built into his legs, and fold out flippers in his feet, in case anything happened to his scuba gear. There was also a curare tipped dart gun built into his hand.