Rob Bjur 
2014 Nissan Frontier King Cab PRO-4X 4dr King Cab 4WD 6.1 ft. SB (4.0L 6cyl 5A)
Nissan Frontier - Great Small Truck
 5 sp auto trans is always trying to upshift to increase gas mileage when it might be more appropriate to remain in the lower gear a little while longer.  Always tries to maintain an rpm of about 1000.