Sift first 7 ingredients into large bowl. Using electric mixer, beat butter and both sugars in another large bowl until blended. Gradually beat in oil. Add eggs 1 at a time, beating to blend between additions. Beat in pumpkin. Add dry ingredients in 2 additions alternately with milk in 1 addition, beating to blend between additions and occasionally scraping down sides of bowl. Cover and chill batter 1 hour.