Calorie son machience compared to mfp

XxBrightsidexX

I was on one of those exerciser bikes today that my friend has. It doesnt ask for your weight or anything, You just pedal , and it assumes the calories you burn by how fast you go i would assume.. After 30 minutes on that bike going 14-16 mph it said i had only burned 105 calories... When i went to add it on mfp, it came uo with 485.. Im not sure which to go with.

I organially thought mfp because it uses your weight to but im just not sure.. Any thoughts ?