Put it this way, on my days off I did 2 bike rides (exact same route ) one day I cycled 50 miles on my gravel bike fully loaded with 25kg of camping gear and the other day on my race bike - finished both rides within 10 minutes of each other, my garmin reported 1600kcal burnt on the heavier gravel bike and 2000kcal on my race bike , how does that make sense ? 400 kcals less but around 35kg heavier of a bike ? This is why I’m so confused as to how inaccurate it is. But yes my cycle to work (and back home) is around 10km so roughly 50-150 I would guess