Posted: Jun 17 2010 at 7:56pm | IP Logged

For the seat belts

http://www.courtesyparts.com/frontier-parts-d22u-1998-2004/g enuine-nissan-parts/seat-seat-belt/868-front-seat-belt/-c-21 29_2130_2293_2294.html

As for fuel mileage, there's a sticky in the performance section.  If you do a lot of highway driving, i'd look at a bed cover.  I noticed a 5 mpg increase on my frontier when I installed mine. 

Posted: Jun 17 2010 at 8:30pm | IP Logged

I had the 2.4L 2wd auto.  if you have something different don't expect anything major.  Plus my truck was only 6 months old when I added it.  Over a couple of years it slowly went back down.

I'd do a tune up (spark plugs, wires) get a exhaust upgrade, the debate over intakes seems to be on right now (i prefer AEM though, though some are just sticking to stock) and keep your foot out of the floor.  LOL

Ideas have been tested on the powerblock series.  Some decent gaines were noted for swapping differential oil, transmission fluid, etc for newer synthetics.  But most of these have been on slightly older model vehicles.  I don't know if Royal Purple gear lube would give any benefits on our newer vehicles. 

Posted: Jun 17 2010 at 9:09pm | IP Logged

The bed cover will help out, especially since you drive 60-65.  You could probably expect around a 3-4 mpg increase.  The added weight of the 4wd kind of kills which is why you see 18 right now.  Plus the cover will give you some security to store stuff. 

Tire inflation is very important, just go by what Nissan recommends for your truck.  There should be sticker in the driver's door jam.  Make sure to check it cold, ie before you drive the truck around. 

As for the exhaust, at the very least a smaller muffler to help free up some flow.  You don't have to get a overly loud exhaust.  Just find something you like the sound of.  Youtube is a great way for this.  The idea on this is the smaller the muffler, the louder the exhaust.  So the larger the muffler, the quieter the exhaust.  The stock muffler is very restrictive though, so just about any aftermarket will give you a very small gain.  HOWEVER, one big concern is if your state does vehicle inspections (you only list US).  I know people use aftermarket exhausts in strict states like NY and Cali, but I know some areas of those states are stricter than others.  I'd hate to see you fork out a little bit of money for a newer muffler only to have the state fail it (if it applies to you)

Proper tire inflation and a bed cover are your best bets to increasing your mileage.  The other items will just add on a little bit more but won't show the gains as much as those.

Posted: Jun 18 2010 at 6:18am | IP Logged

Missouri... an aftermarket muffler is no problem there.  I have a uncle who lives near Rolla and I heard nothing but flowmasters and magnaflows the entire time I was there visiting... LOL. 

My suggestion on the bed cover is something that folds, or rolls up but it s a hard top.  soft tops require changing the snap posistions around for summer and winter and don't offer any security.  1 piece hard tops are nice looking, but if you go to haul something large like a fridge or washing machines you have to remove it completely off the bed.  Pace edwards offer their roll up hard tops, but the one I had required constant maintenance.  BAKFLIP offers a 3 piece hard top that folds up out of the way.  Just food for thought.