Calorie burn on my walking...?

I'm usually pretty sedentary. According to my iPhone I walk around 3.5 miles a day (while holding it, so not including around the house and stuff.) But today I walked a little more (parking farther away and such.) and it said 6 miles walked in total. I have my daily calorie needs set to sedentary, should I change it to lightly active or add in daily miles(which would be 2.5 above my average.) to calories burned...? I'm only trying to maintain, and LOVE to eat, so this is an important factor.

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