Treadmill Calorie Burn vs. MFP Calorie Burn

So I was running on the treadmill at 5.2 for roughly 15 minutes and the treadmill says I have burned 70 calories. When I log it on MFP it says I lost 200 calories. Which calculation should I be using for my journal because this is a HUGE difference on what I can eat in a day. Any advice would be helpful.

Thank You!

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