1. "Why do you record the car driving? That makes absolutely no sense" --> it should make sense with this clarification.
Two different devices are recording - SmartPhone app called LocusMap, and Wahoo HR chest trap.
After the hike, I immediately switch off recording in LocusMap App, but Wahoo HR chest strap continues recording HR in offline mode until strap is removed (you can tap to pause it, but thats not easy to do with multiple layers of clothes in winter, and we don't want to spend time removing the chest strap in cold weather.).
2. Elevation -Got it - thanks for the nicely written article. Its the total elevation.
3. Calories: The article says Runalyze reads value from file. Even Locusmap reads the value from the same GPX file, but displays a different number.