Re: TCH Mileage
With the nav come the energy screen, and there you have to ability to reset the cumulative MPG when you see fit. I use it on a per trip basis, but you could use it for the vehicle lifetime if you don't lose power. Even then, I am not sure if it loses the data with a power outage.
Me, I personally love the analog instant guage as it shows you in a glance if you are increasing or decreasing FE without a lot of quick math. It also shows the rate of change better than numbers changing on a digital display.
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