Instantaneous Fuel Economy (IFE)

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

• 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 instrument panel module (IPM) with fuel information. The distance information is calculated by the IPC using the vehicle speed information from the ECM. These values are retained during ignition OFF and can be changed between English and Metric units by pressing the English/Metric button on the driver information center (DIC) switch. The IFE display cannot be reset.