The pressing question of our time...

Which carbonated and heavily sugared beverage has the most xanthine alkaloid compound that acts as a psychoactive stimulant?

12-ounce beverage milligrams
Red Bull* (8.2 oz) 80.0 (*Special mention for a baseline comparison, not exactly in the cola isle)
Jolt 71.2
Pepsi One 55.5
Mountain Dew 55.0
Mountain Dew Code Red 55.0
Diet Mountain Dew 55.0
Kick Citrus 54.0
Mellow Yellow 52.8
Surge 51.0
Tab 46.8
Diet Coke 45.6
Shasta Cola 44.4
Shasta Cherry Cola 44.4
Shasta Diet Cola 44.4
RC Cola 43.0
Diet RC 43.0
Dr. Pepper 41.0
Diet Dr. Pepper 41.0
Diet Sunkist Orange 41.0
Mr. Pibb 40.0
Sugar-Free Mr. Pibb 40.0
Red Flash 40.0
Sunkist Orange 40.0
Slim-Fast Cappuccino Delight Shake 40.0
Ruby Red 39.0
Storm 38.0
Big Red 38.0
Pepsi-Cola 37.5
Pepsi Twist 37.5
Diet Pepsi Jazz 37.5
Diet Pepsi 36.0
Wild Cherry Pepsi 38.0
Diet Wild Cherry Pepsi 36.0
Diet Pepsi Twist 36.0
Aspen 36.0
Coca-Cola Classic 34.0
Cherry Coke 34.0
Lemon Coke 34.0
Vanilla Coke 34.0
Diet Cherry Coke 34.0
Snapple Flavored Teas (Reg. or Diet) 31.5
Canada Dry Cola 30.0
A&W Creme Soda 29.0
Nestea Sweet Iced Tea 26.5
Nestea Unsweetened Iced Tea 26.0
Lipton Diet Green Tea with Citrus (16.9 oz) 23.0
Barq's Root Beer 23.0
A&W Diet Creme Soda 22.0
Slim-Fast Chocolate Flavors 20.0
Lipton Brisk, All Varieties 9
Canada Dry Diet Cola 1.2
Diet Rite Cola 0
Sprite 0
7-Up 0
Mug Root Beer 0
Diet Barq's Root Beer 0
Sundrop Orange 0
Minute Maid Orange 0
A&W Root Beer 0
Slice 0
Sierra Mist 0
Fresca 0

For a more detailed list that includes coffee and the Energy drinks click here.