It's hard to find reliable calorie burn information. Even heart rate monitors tend to estimate on the high side and the machines at gyms are usually off as well. I'm on MFP and I find that what works best is to just input the calorie burn straight from my Garmin, which is typically a few hundred calories lower than MFP's estimation. Even the calorie counts for the same food can vary on MFP. My advice: use it to help guide you nutritionally, but understand that it's just an estimate and adjust your diet/fitness accordingly.