Diesel Variance Calculation

Last Updated: August 2026

Diesel variance is the gap between diesel you expected to burn and diesel you actually filled. It is how fleets spot leakage, theft, or bad mileage early.

Summary

Diesel variance = actual litres − expected litres (from km ÷ expected mileage). Investigate large positive variance.

Formula

Expected litres = Km run ÷ Expected km/l

Variance (litres) = Actual litres filled − Expected litres

Variance % = (Variance ÷ Expected litres) × 100

Example

Km = 2,000. Expected mileage = 4.0 km/l → expected litres = 500. Actual filled = 560. Variance = 60 litres (12%).

What to check when variance is high

See diesel management software.

Related product: Diesel management software

Frequently asked questions

What variance is acceptable? Set a threshold by route (e.g. investigate above 5–8%). Tune with your history.

Should variance be daily? Trip-wise or weekly is more stable than noisy daily spikes.

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