they are boosted by companies so that people will 'like their equipment, as much as 60 -70% YOu should try a heart rate monitor if you are looking for acurate calorie count
Yeah, they can't be very accurate at all. Take two people who weight the same, but have two completely different builds... they won't burn the same amount of calories.
The only "reading" I ever pay attention to is the distance - other than that /shrug.