Preheat oven to 350℉. Grease the bottom and sides of two 9x5-inch loaf pans. Alternatively, line the loaf pans with parchment paper. Set aside.
In a large mixing bowl, beat together sugar and oil until well combined. Beat in eggs and vanilla extract.
In a large bowl, whisk together flour, baking soda, salt, cinnamon, and pumpkin pie spice. Add flour mixture and milk alternatively to sugar mixture, beating on low speed after each addition. Stir in pumpkin puree until just combined.
Transfer batter to prepared loaf pans. Bake for 50-55 minutes in the center rack of oven, rotating pans midway through baking, until toothpick inserted in center of quick bread comes out clean. Cool in pan for 10 minutes before unmolding onto a wire rack. Cool to room temperature.