Originally Posted by
Null66
I've been told that the calorie estimate would get more accurate with a power meter
While technically true, this implies that there is some degree of accuracy with calorie estimation that does not involve a power meter (ie HR). HR-based calorie estimation is based upon so many dodgy assumptions that it is not just basically meaningless, it is totally meaningless. In fact, it is worse, because it appears to actually be measuring something, when it has only taken a stab in the dark and given a nice valid looking number.