We don’t recommend that you drive or operate heavy machinery after consuming 4 drinks in 10 minutes — regardless whether the mixer is diet or regular.
“Researchers gave college students vodka drinks with regular soda and with diet soda, and the diet soda group got more intoxicated, faster – about 20% more intoxicated than those who mixed regular soda with liquor, according to research published Tuesday in the journal Alcoholism: Clinical & Experimental Research. Sugar in your mixed drink actually slows down the effects of alcohol, researchers say.”
“Researchers gave college students vodka drinks with regular soda and with diet soda”
Sounds like more illegal testing: most college students are too young to legally drink.