Mountain Dew Zero Sugar has more caffeine than Starbucks London Fog on both counts: 68mg per 12 oz can against 40mg per 16 oz grande (40mg at every size), and about 6mg per fluid ounce against 2. The serving sizes differ, so the table below shows both ways of counting.
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 Zero Sugar vs Starbucks London Fog: the numbers
| Mountain Dew Zero Sugar | Starbucks London Fog | |
|---|---|---|
| Caffeine per serving | 68mg per 12 oz can | 40mg per 16 oz grande (40mg at every size) |
| Caffeine per fl oz | 5.7mg | 2.5mg |
| Servings to reach 400mg (FDA context) | 5.9 | 10.0 |
Sources: Mountain Dew Zero Sugar's figure is verified in our Mountain Dew Zero Sugar caffeine guide against PepsiCo product facts (source); Starbucks London Fog's figure is verified in our Starbucks London Fog guide against Starbucks nutrition listing (source).
Which one should you pick?
Pick Starbucks London Fog when you want the lighter dose or a slower ramp, and Mountain Dew Zero Sugar 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 Zero Sugar: the full caffeine guide
- Starbucks London Fog: the full caffeine guide
- The verified caffeine database
FAQ
Does Mountain Dew Zero Sugar or Starbucks London Fog have more caffeine? Mountain Dew Zero Sugar: 68mg per 12 oz can versus 40mg per 16 oz grande (40mg at every size) for Starbucks London Fog.
Which is stronger per ounce? Mountain Dew Zero Sugar, at about 5.7mg per fluid ounce versus 2.5mg for Starbucks London Fog.
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.