I want to try this chocolate cake recipe from Hellmans?

But the box of chocolate cake I have says 19.5 oz instead of 18 which the recipes requires. Since baking is an exact science should I just scrap this idea and follow the directions on the box or should I try the Hellman's recipe anyway? Will the slight difference really matter? Thanks.





SUPER-MOIST CHOCOLATE MAYO CAKE


Servings: 12


Preparation Time: 5 minutes


Cook Time: 30 minutes








Ingredients:


1 box (18 oz.) chocolate cake mix


1 cup Hellmann's庐 or Best Foods庐 Real Mayonnaise


1 cup water


3 eggs


1 tsp. ground cinnamon (optional)








Instructions:


Preheat oven to 350掳. Grease and lightly flour two 9-inch round cake pans*; set aside.


Beat cake mix, Hellmann's庐 or Best Foods庐 Real Mayonnaise, water, eggs and cinnamon 30 seconds in large bowl with electric mixer on low speed. Beat on medium speed, scraping sides occasionally, 2 minutes. Pour batter into prepared pans.


Bake 30 minutes or until toothpick inserted in centers comes out clean. Cool 10 minutes on wire rack; remove from pans and cool completely. Sprinkle, if desired, with confectioners sugar or fill and frost.I want to try this chocolate cake recipe from Hellmans?
throw in an extra tablespoon full of Mayo, and go for it. thats one heaping tablespoon full, or two tablespoons vegetable oil. you'll be fine.I want to try this chocolate cake recipe from Hellmans?
Just add a smidgen more mayonnaise and you should be fine, or remove 1.5 ounces of cake mix. I think the first idea would be easier. I've used this recipe many times and it is wonderful. It seems like a strange idea to put mayo in a cake but it works.