Refine a Fueling Plan

After using the Fueling Tool Sources and Targets to create a Plan, you can edit and refine that plan until it is to your liking.

Upon creation the Plan displays a table for each sport with a row for each Active Source and an input for servings per hour. You can set hourly serving quantities in one of two ways:

  • 1: Manually type serving values into each input field, or
  • 2: Use the icon to open Auto-Fill, which automatically optimizes Source servings to match your Targets as closely as possible
    • Choose the optimization order — for example, optimize Carbs first, then Fluid, then Sodium
    • The algorithm respects each Source’s serving-size constraints (e.g., you can’t use a third of a gel) and follows your Source priority order
    • After Auto-Fill runs, you can still manually adjust any values

As you adjust Source servings and/or use the Auto-Fill feature, the Plan updates in real time.

  • The Target row shows your goals
  • The Hourly Total row shows the calculated totals for carbs, fluid, and sodium based on current Source servings
  • Totals are color-coded to show how close you are to the Target:
    • Green — within 10%
    • Yellow — within 25%
    • Red — more than 25% away
  • The Total row shows projected totals for the full duration of the workout or race

If the Plan isn’t to your liking, you can update Source priorities, swap Active Sources, or even Apply and Activate new Sources to fill gaps in the Plan. After changing your Active Sources, click the icon to update the Plan with the current Active Sources.

Updated on February 4, 2026