Cut wax paper for the bottom of a tube pan. Spray with cooking spray. Preheat oven to 350°F. Empty cake mix in a large mixing bowl. Dissolve 2 tsp. coffee in 1 1/4 cup water. Add coffee mixture, mayonnaise and eggs to the cake mix. Beat with a mixer on medium speed for two minutes or with whisk. Pour batter into tube pan. Bake at 350°F for 40-45 minutes.
Cool cake completely. Turn out of pan and onto a plate. Mix 1 tsp. coffee dissolved in 1 1/2 Tbsp. water with the sifted powdered sugar to make a glaze. Drizzle over the cake.