GURU Original has more caffeine than Mountain Dew: 140mg vs 54mg in the same 12 oz can. That is a 86mg gap, and since the cans match, the per-serving number is the whole story.
These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.
Mountain Dew vs GURU Original: the numbers
| Mountain Dew | GURU Original | |
|---|---|---|
| Caffeine per serving | 54mg per 12 oz can | 140mg per 12 oz can |
| Caffeine per fl oz | 4.5mg | 11.7mg |
| Servings to reach 400mg (FDA context) | 7.4 | 2.9 |
Sources: Mountain Dew's figure is verified in our Mountain Dew caffeine guide against Caffeine Informer (source); GURU Original's figure is verified in our GURU Original guide against Caffeine Informer (source).
Which one should you pick?
Pick Mountain Dew when you want the lighter dose or a slower ramp, and GURU Original when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- Mountain Dew: the full caffeine guide
- GURU Original: the full caffeine guide
- The verified caffeine database
FAQ
Does Mountain Dew or GURU Original have more caffeine? GURU Original: 140mg per 12 oz can versus 54mg per 12 oz can for Mountain Dew.
Which is stronger per ounce? GURU Original, at about 11.7mg per fluid ounce versus 4.5mg for Mountain Dew.
Comparing caffeine? The caffeine comparison tool puts hundreds of drinks side by side, and the caffeine curfew calculator can check your cutoff time for tonight.