Instantaneous Fuel Economy (IFE)

Instantaneous fuel economy (IFE) is calculated using the equation: IFE = Distance/Fuel Used.

• Distance = The accumulated distance travelled for the last 2 seconds
• Fuel = The accumulated fuel delivered for the last 2 seconds

The instrument panel cluster (IPC) receives a GMLAN message from the ECM/PCM. The distance information is calculated by the IPC using the vehicle speed information from the ECM/PCM. These values are retained during ignition OFF and can be changed between English and Metric units accessing the DIC English/Metric menu. The IFE display cannot be reset.