How are people getting 100g+ carbs in a bottle?

Yes. Absolutely. For more info check out these related threads over on slowtwitch.
https://forum.slowtwitch.com/forum/?post=last-7417228#first
https://forum.slowtwitch.com/forum/?post=last-7444621#first

The TLDR of all my comments over there is:

  1. Performance enhancement happens for anything over 60min. Probably useful to fuel appropriately for shorter rides than that.
  2. Use closer to a 1:1 Glu:Fru ratio. 2:1 Glu:Fru ratio is old dogma.
  3. Sucrose works as well as maltodextrin+fructose, and probably better than glucose+fructose.
  4. 90g carbs per hour is bogus dogma. 120-150g/hr is no problem.
  5. 10-18% beverage concentrations are often well-tolerated. (100-180g sugar per liter).
  6. Hydration must be maintained. Use a minimum of 500-1500mg sodium per L. Maybe more…
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