what is the difference between mtn dew zero and diet mtn dew?
We'll still call it Mountain Dew, thank you very much.) ... It also has a load of caffeine: 133 milligrams per 20 ounces, which is more than either Diet or regular Mountain Dew, according to foodbev.com. It also has 0 calories, compared to Diet Mountain Dew's 10 calories, not that there's much of a difference there.