I sometimes like to just sit in my car and listen to music. However, I don’t like draining the 12V battery, so I wanted to know how long I could listen to music with the car “running” and the drive battery charging the 12V. When the GOM turned to 47.5 miles, I started a timer on my phone. At 47.4 miles, I stopped the timer with five minutes and 29 seconds showing. So basically I got 5.5 minutes for every tenth of a mile of range, or 55 minutes for every mile. Which means on a fully charged drive battery, you can run the radio for a LONG time. Noted test conditions: 1. About 70 degrees in my garage 2. Volume set at 8 3. Parking brake was on before the car was started, thus the DRLs were off. 4. Fan was turned off 5. Driver display was turned to minimum brightness. For even longer listening pleasure, the driver display can be dimmed to black, but I needed to see the GOM in tenths of a mile for the test Technically, you can also black out the infotainment display by dimming it completely if you just want to keep listening to whatever source you have chosen. I imagine there are still quite a few electronics running (including the red “P”ark LEDs and passenger seat air bag light), but 55 minutes per mile is still pretty good.