G Fuel Energy (can) has more caffeine than Mountain Dew on both counts: 300mg per 16 oz can against 54mg per 12 oz can, and about 19mg per fluid ounce against 4. 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.
G Fuel Energy (can) vs Mountain Dew: the numbers
| G Fuel Energy (can) | Mountain Dew | |
|---|---|---|
| Caffeine per serving | 300mg per 16 oz can | 54mg per 12 oz can |
| Caffeine per fl oz | 18.8mg | 4.5mg |
| Servings to reach 400mg (FDA context) | 1.3 | 7.4 |
Sources: G Fuel Energy (can)'s figure is verified in our G Fuel Energy (can) caffeine guide against G Fuel product page (source); Mountain Dew's figure is verified in our Mountain Dew guide against Caffeine Informer (source).
The concentration gap is the striking part: G Fuel Energy (can) packs roughly 4 times the caffeine per ounce. Sipping speed matters at that density; a 16 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Mountain Dew when you want the lighter dose or a slower ramp, and G Fuel Energy (can) 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
- G Fuel Energy (can): the full caffeine guide
- Mountain Dew: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does G Fuel Energy (can) or Mountain Dew have more caffeine? G Fuel Energy (can): 300mg per 16 oz can versus 54mg per 12 oz can for Mountain Dew.
Which is stronger per ounce? G Fuel Energy (can), at about 18.8mg per fluid ounce versus 4.5mg for Mountain Dew.
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