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Maurten vs Precision Fuel vs SiS: Gel Data Compared

When you’re deep into a long run, ride, or race, the last thing you want is a gut bomb. Choosing the right energy gel can make or break your performance. Three brands dominate the conversation: Maurten, Precision Fuel & Hydration, and SiS (Science in Sport) . But how do they actually stack up?

We’ve crunched the numbers on carbs, caffeine, sodium, and price per serve. Here is the raw data you need to make an informed choice.

Head-to-Head Gel Comparison Table

Note: We’ve included GU Roctane as a benchmark because it is the only gel in this comparison that contains significant sodium.

Breaking Down the Key Differences

1. Carbohydrate Content: Who Packs the Most Fuel?

• Precision Fuel PF 30 leads the pack with 30g of carbs per serving. This is ideal for athletes targeting high intake (90g+ per hour) without needing to consume multiple gels immediately.
• Maurten Gel 100 sits in the middle with 25g, using their patented hydrogel technology to deliver carbs without stomach distress.
• SiS Go Isotonic offers 22g but is the thinnest gel here, designed to be consumed without water.

Verdict: If pure carb density is your priority, Precision Fuel wins. If you need a gel that sits well on a sensitive stomach, Maurten is the gold standard.

2. Caffeine Options: Smart Boost vs. Heavy Hit

• Maurten Caf 100 delivers a massive 100mg of caffeine — equivalent to a strong cup of coffee. This is a serious performance enhancer for the final push.
• Precision Fuel PF 30 Caf and SiS + Caf both offer 75mg — a moderate, sustainable boost that won’t cause jitters.
• GU Roctane has just 35mg, making it a lighter option for those who want a small kick.

Verdict: Maurten is for the caffeine-tolerant athlete. SiS and Precision Fuel are better for steady pacing.

3. Sodium & Electrolytes: The Missing Link

This is the biggest differentiator. Maurten, Precision Fuel, and SiS all contain 0mg of sodium per gel. They rely on the athlete to get electrolytes from drinks or tablets.

• GU Roctane is the outlier with 125mg of sodium, plus branched-chain amino acids (BCAAs).

Why this matters: On a hot day or a long event, sodium is critical for fluid absorption and preventing cramping. If you choose Maurten, Precision Fuel, or SiS, you must pair them with an electrolyte drink.

Verdict: If you want an all-in-one gel, GU Roctane is better. If you prefer to manage electrolytes separately, the other three are fine.

4. Price Per Serve: Budget vs. Premium

• SiS is the cheapest at $2.50/serve. It is a workhorse gel that gets the job done.
• Precision Fuel sits at $3.00–$3.20, offering a premium carb load at a mid-range price.
• Maurten is the most expensive at $3.50–$3.80. You are paying for the patented hydrogel technology and the "no taste, no texture" experience.

Verdict: SiS is the best value. Maurten is the premium splurge.

Which Gel Should You Choose?

Choose Maurten if:

• You have a sensitive stomach or struggle with gel texture.
• You want the highest caffeine option (100mg).
• Budget is not your primary concern.

Choose Precision Fuel if:

• You want the most carbs per gel (30g).
• You prefer a balanced caffeine dose (75mg).
• You want a mid-range price with top ratings.

Choose SiS if:

• You are on a budget.
• You want a thin, isotonic gel that doesn’t require water.
• You are fine with lower carb density (22g).

Choose GU Roctane if:

• You want built-in sodium and electrolytes.
• You want BCAAs for muscle recovery.
• You want a gel that works as a standalone fuel source.

Final Takeaway

There is no single "best" gel — it depends on your race strategy, stomach tolerance, and budget.

• For pure performance with stomach comfort: Maurten.
• For maximum carb intake per gel: Precision Fuel.
• For affordability and simplicity: SiS.
• For all-in-one fuel with electrolytes: GU Roctane.

Pro Tip: Test your chosen gel during long training runs, not on race day. And remember: if you use Maurten, Precision Fuel, or SiS, always carry an electrolyte source to avoid sodium deficiency.

Happy fueling!