Some people here might need to know this. I don’t drink mixed drinks, but I did find it very interesting that using an articifially sweetened mixer increases breath alcohol levels by 20% more than when regular mixers are used.

http://onlinelibrary.wiley.com/doi/10.1111/acer.12039/abstract

“Participants (n = 16) of equal gender attended 3 sessions where they received 1 of 3 doses (1.97 ml/kg vodka mixed with 3.94 ml/kg Squirt, 1.97 ml/kg vodka mixed with 3.94 ml/kg diet Squirt, and a placebo beverage) in random order. BrACs were recorded, as were self-reported ratings of subjective intoxication, fatigue, impairment, and willingness to drive. Objective performance was assessed using a cued go/no-go reaction time task.”

Only 16 participants, that is nowhere near enough for a conclusion of this sort. For example, 16 is not a large enough number for “random order” to be fully random because the standard deviation is proportional to the square root of the number of participants.