Yes, my daughter does that. Her cakes taste flat and awful. I don't even bother to eat a piece. The amount of oil in a slice of cake is small when you consider only a fourth cup goes into the whole cake.
Yes, it is one for one. It's best for cakes and muffins, doesn't work as well for cookies, unless they are soft cookies. You might want to add a little less sugar, since applesauce is sweet. Also try half applesauce half oil the first time to see if you like it. You can also use plum apple baby food.
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