I always wondered why my lifetime efficiency would go down when my trip meter is clearly displaying that my efficiency is going up. I think i figured it out today. While at a Fast charger my Lifetime as displayed in the My Chevrolet app was at 3.7 Miles per kilowatt. After charging for an hour the app registered 3.6 K/M lifetime. The app is apparently calculating with Kilowatts added to the battery, rather than kilowatts used by the Bolt. I will further watch to see if lifetime goes up as I drive, but don't charge. My car is relatively new, so this result should smooth out over the years.