% of time fleet was actually in use vs. potential available time.
mpg or km/litre, fleet-wide or by individual truck/driver.
% of actual load carried against potential fleet capacity (tonnes or cube).
Average fleet utilization in cubic capacity or tonnes carried (in + outbound).
Per-day standing cost (depreciation, vehicle excise duty, operator licence, insurance) regardless of whether the vehicle runs.
Fleet running cost per mile/km — fuel, tyres, lubricants, maintenance.
Total fleet cost per mile/km — running + standing + driver costs combined.