Looking at the calorie burn on my first few commutes with my new Garmin 530, they seem excessively high. A 32min ride and the Garmin reports a calorie burn of 517kcal. This implies that I averaged 278watts during my commute! I know what 278watts feels like and I definitely wasn’t doing 278watts, it felt more like 100-150w. Is this a bug? Is there anything that I might not have configured?