iRacing Fuel Strategy Guide
Fuel strategy separates good endurance teams from great ones. Even a single miscalculated stop can cost you the race. This guide covers the full toolkit — from baseline calculations to race-day adaptations.
1. Establish your baseline fuel numbers
Before any race, you need two numbers: standard fuel per lap and fuel-saving fuel per lap. Standard is your natural pace consumption. Fuel-saving is what you can achieve by lifting and coasting into braking zones and short-shifting. Most iRacing cars support a 5–15% fuel reduction in saving mode. Run laps in both modes during practice and note the values from the F2 box. <!-- TODO: editorial review — add screenshot reference -->
2. Calculate your pit window
Your pit window = how many laps your fuel allows. With a 80 L tank and 3.2 L/lap standard consumption, you get 25 full laps (floor of 80/3.2). In fuel-saving mode at 2.8 L/lap you get 28 laps. The difference of 3 laps per stint over a 24-hour race at 1:45 lap times means 20+ fewer minutes of pit time — a real competitive edge. Use the Fuel Calculator to model your scenario.
3. When to use fuel-saving mode
Fuel-saving costs lap time (typically 0.5–2 seconds per lap depending on the car). Use it when: (a) you're running a lap ahead of the car behind, (b) you want to extend a stint to avoid a costly pit during a green-flag traffic window, or (c) you need to reach the next full-course yellow. Never fuel-save when fighting for position on the last stint.
4. Safety car strategy
Full-course yellows (FCY) are the biggest strategic inflection points. When a FCY is called: (a) estimate remaining laps in the stint, (b) if you're within 3 laps of your pit window, come in now — you get a free stop under yellow, (c) if you're far from your window, stay out and bank the position. A pit under FCY saves 15–25 seconds vs a green-flag stop. Teams that react fastest gain the most.
5. Fuel targets and live tracking
Set a fuel target per lap (e.g. ≤3.1 L/lap) and track the rolling average in your pit board or dashboard. If you drift above target early in a stint, apply light saving mode immediately — it is easier to recover 0.1 L/lap over 10 laps than to sprint-save over 3. If you drift below target, you have margin to push harder and bank lap time.
6. Multi-class fuel management
In multiclass races, blue-flag traffic affects real lap times and therefore real fuel consumption. Budget an extra 0.1–0.2 L/lap in classes that typically generate heavy traffic (slower classes). Consistency of line and braking minimizes the spike. <!-- TODO: editorial review — add class-specific examples -->
Key formula
Laps per stint = floor(tank / fuel per lap). Total fuel = ceil(race laps) × fuel per lap + one lap margin.
Ready to run your numbers?
Open Fuel Calculator →