There is a simple mathematical formula that calculates calories burned. Google it.
1. Walking burns less per mile than running.
2. Running burns approximately the same per mile regardless of speed (10 cal difference per mile at 1:00 faster pace).
3. Calories burned over a 24 hour period following higher intensity exercises exceeds calories burned over a 24 hour period following lower intensity exercises (afterburn effect).
So....if your goal is weight loss then focus on higher intensity exercises (sprints, intervals, weight training) alternating with lower intensity lower impact exercises.
Key points OK. Conclusion utterly wrong.
You can run a few miles at high intensity and you will expend a few calories more than if you run them at an easy pace. But you can run way more miles at an easy pace than at high intensity. There's simply no comparison. A few percent extra calories expended can be offset 10-fold by running further at an easy pace.
So....if your goal is weight loss then focus on high mileage.
And that's what pretty much every good runner would know from experience.