Yep, the diet pop (or the pumpkin in the alternative recipe) are replacing all of the added ingredients: oil, water, eggs - whatever the mix calls for.
i just made one with white cake and sprite zero, of course i had to like the batter out of the bowl and i could taste some of the pop in it but once it was baked it tasted like normal cake, i just didnt holod together very well, i used cool whip as icing and i think i like it better without lol i want more now lol
German chocolate cake with diet Dr Pepper Yummy. it was just like any cake in denseness and was delicious. I'm going to the store tomorrow, I am going to get maybe a spice cake and pumpkin puree and angel food cake and crushed pineapple, I have a tendency to get carried away on these things so will need to reign myself in a little.
I have tried the cake mix with the soda recipe twice and both times it came out horribly...it fizzed up and cooked awful.. I would rather buy a sugar free cake mix to be honest... or have no sugar added ice cream instead..