MPG INST (analog)

The MPG INST message is based on the previous few seconds of vehicle operation. The IPC calculates the instantaneous fuel economy (IFE) parameter as follows: IFE = Distance / IHCI Used x Scale Factor. The IPC determines the distance from the discrete vehicle speed input to the IPC and the IPC receives the fuel data from the PCM.

The driver may not reset the calculation. The data that the IPC uses in order to calculate the IFE parameter is lost if a battery disconnect occurs. The message contained dashes if the IPC may not communicate with the PCM through the class 2 serial data line.