Preheat oven to 350 degrees. (If making a cake rather than cupcakes, grease and flour three 8 inch cake pans).
In a separate bowl, add the flour, sifted cocoa, baking soda, baking powder and salt. Whisk to blend and set aside.
In the bowl of your mixer, beat the softened butter on medium speed until light and creamy. Add the vegetable oil and vanilla extract.
Gradually add the sugar and mix until light and fluffy, approximately 4 to 5 minutes.
Add the eggs 1 at a time, mixing after each egg just until the yellow of the yolk has blended. Scrape down the sides and bottom of the bowl as needed.
Mixing on low speed, alternately add the flour mixture and milk to the sugar mixture, beginning and ending with the dry ingredients. (3 additions of dry ingredients and 2 additions of milk) Mix just until combined.
Add the cup of hot coffee at this time on low speed, mixing just until combined. The batter will be very thin. Don't worry this is how it should be.
If making cupcakes, scoop the batter (about ¼ cup per cupcake) into the cupcake liners and bake at 350 for about 16-18 minutes, or until the tops spring back when lightly touched or a toothpick comes out clean or with just a few crumbs attached. (Makes about 3 dozen cupcakes).
Makes 9 cups of batter.