Instant Fuel Economy

The instant fuel economy display is based on the previous few seconds of vehicle operation. The Instantaneous Fuel Economy (IFE) parameter is calculated by the IPC using the following formula:

(IFE) (Distance) / (Fuel Used) x (Scale Factor) The distance is determined from the discrete vehicle speed input to the IPC and the fuel data is received from the PCM.

This calculation may not be reset by the driver. The data used in order to calculate the IFE parameter is lost if a battery disconnect occurs. The message contains dashes if the IPC is unable to communicate with the PCM or PZM via the class 2 serial data line.