for many years the calories and kJ (mechanical work) count for me were almost identical for bike rides with power meter readings. In other words, Garmin used the traditional 1 kcal = 1 kJ.
Now since a few days I get completely different readings, with significantly more calories burned than mechanical work (kJ).
Does Garmin Connect add basic metabolic rate to the active burned calories, or does it estimate a lower mechanical efficiency?
I have a Garmin 1030 and pedal based powermeter, but I see the same for my friends too.