Question 1
Note about the "fairly confident". While you may never be 100%, and there's always room for improvement, you are fairly confident that you are as ready as can be expected.
Question 2
Question 3
Question 4

There are times when you may have no choice but to leave your home/area (floods, wild fires, etc.)

Note about vehicle range. I am referring to if there's no outside source of fuel (ie. gas stations are closed). What you have today is all you will ever have.

1000 km = 600 miles

Question 6 (#5 reworded)

1km = 0.6 miles
5km = 3 miles
10km = 6 miles
50km = 30 miles
100km = 60 miles
300 km = 180 miles