saying about 100m I ment 92 kcal per 100m. My calculations were rather long: 2 times running of 3000m each time and 2 times walking 1800 m each. Then I devided calories to meters and got 92kcal/100m.
Yes you're right, running consumes more calories than walking, and this is also the way it is coded in Run.GPS. Maybe 100m are a bit short for a test.
If you want more precice calorie calculation, you could use a heart rate monitor. If a HRM is connected, Run.GPS automatically uses the data from this source.