The problem after a tracking system goes live is rarely too little data — it is too much. There are dozens of numbers on screen and no obvious place to start. The seven metrics below move fleet cost and safety directly, so we suggest starting with these.
1. Idle time
Ignition on, vehicle not moving. Fuel burns, engine hours accumulate, no work gets done. In most fleets this is the most overlooked line and the easiest to reduce.
What to look at: idle minutes per vehicle per day, and idle time as a share of total running time. The gap between two vehicles doing the same job usually comes down to driver habit, and closes quickly once it is discussed.
2. Vehicle utilisation
Every vehicle in the fleet costs money — insurance, tax, maintenance, depreciation. How many days a month a vehicle is actually used tells you whether the fleet is the right size.
What to look at: days in motion and distance covered per vehicle per month. Vehicles permanently at the bottom can be released or moved to a busier route.
3. Fuel per distance
Fuel is usually the largest variable cost in a fleet. Total fuel spend tells you nothing on its own; the real indicator is consumption per distance covered.
What to look at: average consumption per 100 km, by vehicle and by driver. A persistent gap between two vehicles of the same model points either to a maintenance need or to driving style.
Note: this metric is only reliable if the device can read the vehicle's own fuel data over the CAN bus. Consumption estimated from GPS data alone stays rough.
4. Driver behaviour
Harsh acceleration, harsh braking and speeding all push up fuel and maintenance cost and raise accident risk. All three start to change the moment they become measurable.
What to look at: harsh braking and acceleration counts per vehicle, and time spent over the speed limit. Most platforms fold these into a single driver score; the trend over time matters more than the score itself.
5. Maintenance timing
Scheduling maintenance by distance rather than by calendar avoids both unnecessarily early servicing and the breakdowns that follow late servicing.
What to look at: current odometer per vehicle and distance remaining to the next service. If the system can read engine fault codes, you can be warned before the warning light comes on.
6. Geofence breaches
Once you define where a vehicle should be, learning that it is somewhere else becomes automatic. This is both a security and an operational matter: unauthorised use and unplanned routes both show up here.
What to look at: entry and exit records for defined zones, and movement alerts outside working hours.
7. Planned versus actual
If the fleet carries work — shuttles, deliveries, field teams — the real question is not where the vehicle is but whether the planned work happened on time.
What to look at: the difference between planned route and actual route, and arrival time deviation per stop. A route that always slips is a planning problem more often than a driver problem.
Do not start with all seven. Focusing on idle time and driver behaviour for a month is usually enough to produce a measurable saving in most fleets; add the rest afterwards.
Frequently asked questions
- Which fleet metric saves the most money?
- In most fleets, idle time. Time spent stationary with the ignition on burns fuel and adds engine hours; once it is measured and discussed with drivers it usually falls quickly.
- Can I measure fuel consumption from GPS data?
- You can only estimate it. Reliable consumption measurement requires the device to read the vehicle's own fuel data over the CAN bus.
- How is a driver score calculated?
- Usually by relating events such as harsh braking, harsh acceleration and speeding to the distance covered. The trend for a given driver over time is more meaningful than the absolute score.