Actually the NAH like the Pirus Camry have a continuously variable ration transmission. These systems are step-less and provide any ratio required.
I owned two Nissan Murano's before with the same type transmissions.

The Phaeton which had an adaptive 6 speed transmission did learn when to shift to fit my driving style and thereby provide the most efficient gear ration to be in. The mileage on the nearly 6000 pound full time 4 wheel drive car was astounding averaging 18.1 over the lifetime of the car. We ran the AC un-abated and drove the same as we do now having lived in our home for 12 years.

It also had This is partially why I am so disappointed at the NAH and think that a good dose of German engineering would greatly improve it.

AS I said before the mileage stinks.