Preheat oven to 350 degrees. Coat bottom and sides of a 13x9x2-inch baking pan with cooking spray. Stir pumpkin, milk, egg substitute, sugar and pumpkin pie spice together in a medium bowl until smooth; pour into pan. Sprinkle dry cake mix over pumpkin mixture and gently press it into pumpkin mixture to moisten. Sprinkle cake with pecans and then drizzle margarine evenly over top. Bake, uncovered, until knife inserted in center of cake comes out clean, about 50 to 60 minutes. Cool completely before slicing into 16 pieces.
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