Map calories burned?

I think that if they knew they were always off by a particular factor, they would just change the numbers accordingly. The reason why MFP can be so inaccurate with estimating calories burned is because every person is different - so the amount they are over for you will be different than for someone else.

As a general rule of thumb, people on MFP tend to recommend starting with eating back 50% of your exercise calories, and then adjust accordingly (e.g. if you are losing weight too fast, then eat more; or if you are not losing weight fast enough, then eat less). After a while, you will have enough experience to know more clearly how far over (or under) MFP is estimating calories for you personally.