Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.

Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.

Automotive Calculators

Race Strategy Fuel Calculator

2026-09-27 6 min

Fuel stints required and laps per tank from race laps, burn rate and tank size.

Fuel Stints: 6 stints
Laps Per Tank: 10 laps

Calculator

Race Laps

Fuel Per Lap(gal)

gal

Tank Size(gal)

gal

Results update live as you type

Live statistics

Fuel Stints

6 stints

Laps Per Tank

10 laps

Results

Optimal

Fuel Stints

6stints

Laps Per Tank

10laps

Planning estimate from standard automotive formulas. Validate with dyno, timeslip or datalog data when precision matters.

Visualizations

Results overview

6Fuel Stints

10Laps Per Tank

Fuel Stints vs. Race Laps

Fuel Stints

6stints

110

Formula

Total fuel rounded up to whole tanks, with usable laps per full tank.

Stints = ceil(race laps x fuel/lap / tank); laps/tank = floor(tank / fuel/lap)

Variables

Symbol	Name	Unit	Description
N	Stints	count	Tankfuls including the start
L	Laps per tank	laps	Whole laps one tank covers

Explanation

60 laps at 2.2 gal/lap needs 132 gal — six 22-gal stints of 10 laps each.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Record the inputs.

Race Laps:60

Fuel Per Lap:2.2 gal

Tank Size:22 gal

Result: 3 inputs ready

Step 2

Apply the formula.

Stints = ceil(race laps x fuel/lap / tank); laps/tank = floor(tank / fuel/lap)

Result: Primary result = 6 stints

Step 3

Read every derived output.

Fuel Stints:6 stints

Laps Per Tank:10 laps

Result: Fuel Stints = 6 stints

Final Answer

Worked Examples

See how the calculator works with different scenarios.

Scenario

2.2 gal/lap burn, 22-gal tank.

Inputs

Race:60 laps

Fuel/lap:2.2 gal

Tank:22 gal

Calculation

132 gal / 22 = 6 stints; 22 / 2.2 = 10 laps/tank

Result

6 stints of 10 laps.

Interpretation

Plan 5 stops and align tire changes to the same windows.

Understanding Your Result

Your Result: Fuel Stints: 6 stints

What This Means

How many tankfuls the race takes and how far each one goes.

Why It Matters

Stint structure anchors the whole strategy — tires, drivers and cautions layer on top.

Professional Interpretation

Treat the primary result as a planning estimate, then validate on a dyno, at the track, or with logged sensor data. If measured numbers disagree by more than ~10%, re-check inputs (units are the usual culprit) before changing parts.

Recommendations

•Double-check units on every input before trusting the result
•Compare against the worked example below to sanity-check magnitude
•Validate with measured data (dyno, timeslip, datalog) when it matters

Learn — fuel economy, deeply

Strategy starts by dividing total fuel into tank-sized stints.

1 · Where the gallon goes (energy path)

Engine heat

60–70% lost

Coolant + exhaust carry most energy away. Hybrids recover some via Atkinson cycle + regen.

Driveline

5–15% lost

Transmission, differential, accessories. CVTs and 8–10 speed autos lose less.

Aero drag

∝ v²

Doubles from 55→78 mph. Roof boxes hurt more than trunks.

Rolling + brakes

10–20%

Tires, weight, stops. Regen braking (hybrid/EV) reclaims city braking energy.

4 · Measure like a pro (the 3-tank protocol)

Fill to first click at the same pump, record the odometer (Tank 0).
Drive normally for 2–3 tanks; always refill to first click at the same pump.
MPG = total miles ÷ total gallons across all tanks — averaging kills pump-click noise.
Cross-check with the trip computer; a persistent >10% gap means the computer needs calibration — or the car needs service.
Log with an OBD-II dongle for per-trip MPG if you want to isolate commute vs. highway behavior.

Practical Tips

•Round laps-per-tank down, never up
•Align tire stints to fuel stints when possible
•Keep one caution-extended stint in reserve planning

Common Mistakes

Mixing units (inches with mm, psi with kPa)

Convert every input to the unit shown on its field before calculating.

Trusting a single output blindly

Cross-check with the worked example and, when it matters, a dyno or datalog.

Assumptions

This calculator makes the following assumptions to provide estimates:

Steady-state model: Formulas assume stabilized conditions; transients, heat soak and traction limits are excluded.

Standard factors: Empirical constants (BSFC, VE, drivetrain loss) use typical values — your combination may differ.

Limitations

Be aware of these limitations when using this calculator:

Estimate, not measurement: Predictions carry real-world scatter of roughly ±5–15% depending on the model.

No transient effects: Shift time, wheelspin, spool lag and heat soak are not modeled here.

Frequently Asked Questions

Answers to common questions about this calculator.

Why round stints up and laps down?

You cannot run a fraction of a tankful short — conservative rounding keeps the car from running dry.

Do cautions change the plan?

Yes — yellow laps burn far less, so real stints often stretch past the green-flag math.

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Related Guides

Deepen your understanding with these educational resources.

Automotive Guides

Build planning, measurement protocol and validation how-tos

Glossary

Technical terms used in mortgage calculations explained in plain language.

MPG: Miles per gallon. Distance travelled per gallon of fuel; higher is better. US gallon = 3.785 L.
L/100 km: Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.
MPGe: Miles per gallon-equivalent. EV metric: miles travelled on 33.7 kWh (energy of 1 gal of gasoline).
CAFE: Corporate Average Fuel Economy — US fleet-average efficiency standard enforced by NHTSA.
Rolling resistance: Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.
Aerodynamic drag: Air resistance growing with the square of speed — why highway MPG falls fast above 60 mph.
Hypermiling: Driving techniques (coasting, steady speed, anticipation) that maximise real-world MPG.
OBD-II: On-board diagnostics port. Scanners and dongles read live MPG, fuel trim and fault codes.

Authoritative References

Trusted sources and standards referenced by this calculator.

EPA — FuelEconomy.gov DOE — Fuel-Efficient Driving Tips NHTSA — Driving Safety & Efficiency SAE International — Fuel Economy Standards Consumer Reports — MPG Truth IRS — Standard Mileage Rates

Applicable Standards

EPA Fuel Economy Testing (40 CFR Part 600)CAFE — Corporate Average Fuel Economy Standards (NHTSA)WLTP — Worldwide Harmonised Light Vehicle Test ProcedureSAE J1321 / J1711 — Fuel consumption test proceduresISO 2575 — Road vehicles symbols & efficiency markings

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Last Updated:

2026-09-27

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.