Plenty, especially when doing late night drives. I particularly like Red Bull's own Cola, they've gone for an original organic version, using all the spices from the old recipie's -
Ingredients
A can of Red Bull Simply Cola contains:[1]
Water
Sugar
Carbon dioxide
Natural caramel flavor
Natural flavors from plant extracts (0.37%): galangal, vanilla, mustard seed, lime, kola nut, cocoa, liquorice, cinnamon, lemon, ginger, coca leaf (absent in Switzerland [2]), orange, corn mint, pine, cardamom, mace, clove, and lemon juice concentrate
Caffeine from coffee beans.
Red Bull Simply Cola also has slightly more caffeine, at 45 milligrams per 355ml (12-ounce) can, than Coca-Cola (34 mg) or Pepsi-Cola (37.5 mg), but less than Diet Coke (47 mg) or Pepsi One (54 mg) or Mountain Dew (54 mg).[3] The cola contains significantly less caffeine than Red Bull's eponymous energy drink (80 mg per 8.2 ounces).[4] It also lacks the artificial flavors, colors, and phosphoric acid commonly used in commercial colas.