> For the complete documentation index, see [llms.txt](https://navixy.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://navixy.com/docs/user/guide/events-and-notifications/vehicle-efficiency.md).

# Vehicle efficiency

- [Fuel level change](https://navixy.com/docs/user/guide/events-and-notifications/vehicle-efficiency/fuel-level-change.md): Alert when the fuel sensor detects a significant level change, signaling refueling or potential fuel theft. Requires a configured fuel level sensor per device.
- [Excessive idling](https://navixy.com/docs/user/guide/events-and-notifications/vehicle-efficiency/excessive-idling.md): Alert when a vehicle idles for longer than a set threshold, using platform logic or hardware events. Helps identify fuel waste and unnecessary engine running.
- [Check engine (MIL)](https://navixy.com/docs/user/guide/events-and-notifications/vehicle-efficiency/check-engine-mil.md): Receive an alert when the Malfunction Indicator Lamp (check engine light) activates on a vehicle. Requires a GPS device with OBD or CAN data support.


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