Bob 
2007 Nissan Frontier Crew Cab Nismo 4dr Crew Cab 5.0 ft. SB (4.0L 6cyl 5A)
Needed better mpg with this truck
 I needed a truck.  After I got this one I wasn't getting the mpg I thought I should.  Well, one night I was on the interstate and I went just below 2000 rpm, about 1800 and locked in the cruise control. My mpg went up to over 24. My speed was about 65. With the present gas prices this might help you get some better mpg.  Now I don't feel so bad. I like this truck.    Mine is a 2 wheel drive Nismo with automatic.  My best mpg is 27 using this method. I avg about 24 on the highway.  Around town , 17 like everyone else.  Hope this helps.   You can go up to just about any speed and cut your rpms to about 1800 (or a little above) and improve your mpg.