Your "remaining" range depends on how you drive the car over a long distance. It is calculated from an average and is not valid for only a short distance that is not necessarily representative of the average. Imagine if you are averaging 25miles/gallon on a long highway trip, then exit for the last 25 miles of your trip, with 25 miles on your "remaining" range you then have 1 gallon left. But now off the highway your mileage is only 12mpg, so you run out when the range still shows about 12 miles. I suspect Nissan doesn't want to be blamed if you run out when it still says 5 miles to go, so they blank it out, probably when you have something like 2 gallons left.
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