Posted: Jan 05 2007 at 12:53pm | IP Logged

I just bought a 98 4x4 but the gas milage isnt what i thought it would be (12 mpg highway) from everything i have read it should be around 25.  the truck now has 31's on it and i am wondering if i can reprogram the ecm to accept the tires i know on newer cars you can to this i just dont know much on Nissans yet.  i have a K&N filter and have change the fuel filter and put a new set of NGK plugs in it, it seems to be getting better but now what is should be. any other ideas please throw them at me.

 Thanks