How many calories did I REALLY burn?

According to mfp, a person of my height and weight (5'6" 153lbs) burns 115 calories walking for 30 min. at 3mph. According to livestrong and a couple of other places it's closer to 180. That's a pretty big difference. Big enough that I am questioning this and wondering about it, mainly because I have a history of doing crash dieting to the point that I effed up my metabolism. I am concerned about getting ENOUGH calories to keep losing. I don't want my body to go into starvation mode. Does anybody know what the deal is?

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