Does diet Dr. pepper go flat faster than Dr. pepper?

Diet Dr. Pepper may go flat faster than regular Dr. Pepper due to the differences in their formulations. Diet sodas often contain artificial sweeteners, which can alter the carbonation retention. Additionally, the absence of sugar in diet sodas can affect how carbonation interacts with the liquid. However, the difference in flatness rate is generally minimal and can vary based on other factors like storage conditions and how the soda is served.