Abstract: A system and method for calculating and displaying average auxiliary power use in a vehicle is provided. The vehicle includes an auxiliary battery for powering auxiliary electrical devices, an auxiliary battery controller, a display for displaying both instantaneous and average auxiliary power consumption, and an electric motor. A main battery powers the electric motor. The auxiliary battery is connected to the main battery via a DC/DC converter. A sensor detects instantaneous auxiliary power usage from each of the auxiliary loads. The vehicle includes a combination meter configured to calculate an average auxiliary power usage amount based on the plurality of instantaneous auxiliary usage amounts. A display operable to display the average auxiliary power usage amount over the predetermined period of time and display each instantaneous auxiliary power usage amount.