The rental utilisation math nobody puts in the brochure

Revenue is daily rate multiplied by days booked, and days booked is the variable that decides everything. A car cannot be booked while it is being cleaned, while it is in service, while it is being repaired, or during the demand troughs every market has. Model the calendar honestly and the picture changes before a single cost is subtracted.

Then subtract properly: cleaning and turnover per booking, accelerated maintenance because rental miles accumulate fast, tyres and brakes on a shortened cycle, the insurance delta for commercial use, the management fee, and — the item most often omitted — depreciation that runs faster because mileage climbs faster.

Class fit changes the shape of the curve. Reliable mainstream vehicles book steadily at modest rates and produce the most predictable net. Exotics post headline rates with thin, seasonal demand and punishing running costs. Owners who chase the rate rather than the utilisation usually discover this in month four.

The single largest controllable variable is downtime. Every day in a body shop is zero revenue plus a repair bill, which is why turnaround speed matters more to the annual number than the daily rate does. Keeping repair and rental inside one organisation is not a convenience argument — it is the difference between a car that earns and a car that idles.