Tredmill miles

Recently I have made the commitment to walk at least fifteen miles per week. So far I have fallen a little short, not because I wanted to slack off, or laziness, but because of blistering feet. However, I did find a temporary solution to that, stationary bike. The treadmill still hurts my blisters to the point where I can't walk half a mile before I start limping. To get the calorie burning effects of the treadmill, I replaced that with the elliptical machines, which by the way works out all muscles of the legs for an excellent cardio-workout.
But my mileage is suffering, since I can't calculate number of miles walked on it, but calories burned are calories burned, if I burn about 600 calories per hour walking, it really makes no difference how you get those 600 calories burned, whether its walking, running, or via the elliptical machine, you still burn 600 calories.
Not since it takes about 3500 calories per pound of fat, it means I would have to burn about 1200 calories per day for at least 3 days to get rid of a pound of undesired fat tissue, or as some books name it, adipose tissue. I should call it cellulite, but heck, there is nothing lite about it, fat is fat, and nothing can change that.