Originally Posted by ScottRae

When out riding I have notice that according to the computer on my handlebar I am burning around 40 calories a mile. I realize that my weight and age and speed all factor into the equation, but is something around 40 calories burned a mile what others are seeing? Or do I need to recalibrate.
Cheers

If you do not have a powermeter, you do not have a half-way accurate way of assessing the calories you are burning. Period.

Beyond that, riding faster and longer burns more calories than riding slower and shorter distances. Being able to measure and quantify these things can be useful, but only if these measurements are valid. Heart rate, speed, age, etc, etc are relevant, but cannot be used to measure calorie burn with any degree of accuracy or reliability.