Car rental vehicle utilization measures the share of available rentable-vehicle days that generate rental activity during a period.
A simplified formula is:
vehicle utilization = transaction days ÷ available vehicle days × 100%
Utilization links rental demand with fleet size
Hertz defines available car days as average rentable vehicles multiplied by the number of days in the period.
In its Americas rental business, Hertz reported 30.895 million transaction days and 37.387 million available car days in the second quarter of 2026, producing vehicle utilization of about 83%.
Avis Budget reported total-company utilization of 72.6% in the same quarter.
Issuer definitions and fleet scopes differ, so those percentages should not be treated as perfectly comparable.
Higher utilization can improve asset productivity
A rental vehicle creates revenue when it is on rent and generally continues to incur ownership and financing costs when it is idle.
Higher utilization can therefore raise revenue generated per vehicle and spread certain fleet costs across more transaction days.
That relationship is why utilization and Car Rental Revenue per Unit per Month are closely connected.
Extremely high utilization can create service problems
A fleet that is too tight may leave fewer vehicles available for walk-up demand, replacement needs, maintenance, recalls, or unexpected geographic shifts.
Management therefore balances utilization against service levels and pricing opportunity.
The best utilization rate is not necessarily the highest possible percentage.
Fleet-definition changes can break time-series comparisons
Hertz changed its definition of Average Rentable Vehicles in the first quarter of 2026 to use a daily average instead of a simple beginning-and-end average.
The company recast prior periods.
This is exactly the kind of methodology change investors should preserve rather than silently splicing incompatible data together.
Primary-source examples
- Hertz second-quarter 2026 Form 10-Q
- Avis Budget second-quarter 2026 results
- Avis Budget first-quarter 2026 Form 10-Q
Car rental vehicle utilization is most useful as a fleet-loading measure that connects demand with available vehicle capacity.
Part of the Car Rental Operating Model
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