"I love this truck. I have only owned three cars my entire life and all three of them have been Nissans. I had a 1990 pickup, 1995 200sx SE-R, and now a 2006 Frontier LE.
I took this truck on a month long trip across the United States pulling a 4000lbs travel trailer..... over 9000 miles Grand Canyon, Death Valley (114degrees), Yosemite, Yellowstone (17degrees at night), and Mount Rushmore.
Truck never missed a beat.
Actual gas mileage is about 19.5 Highway and about 18 city. Pulling the 4000 trailer I got 8-12 mpg.