G Fuel Energy (can) vs McDonald's brewed coffee: which has more caffeine?

G Fuel Energy (can) has more caffeine than McDonald's brewed coffee: 300mg vs 145mg in the same 16 oz can. That is a 155mg 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.

G Fuel Energy (can) vs McDonald's brewed coffee: the numbers

Sources: G Fuel Energy (can)'s figure is verified in our G Fuel Energy (can) caffeine guide against G Fuel product page (source); McDonald's brewed coffee's figure is verified in our McDonald's brewed coffee guide against Caffeine Informer (source).

Which one should you pick?

Pick McDonald's brewed coffee 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
• McDonald's brewed coffee: 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 McDonald's brewed coffee have more caffeine? G Fuel Energy (can): 300mg per 16 oz can versus 145mg per 16 oz medium for McDonald's brewed coffee.

Which is stronger per ounce? G Fuel Energy (can), at about 18.8mg per fluid ounce versus 9.1mg for McDonald's brewed coffee.