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I’ve been looking into a way to better gas mileage in my 2004 3.3L Xterra V6 Supercharged. I’m currently getting around 12 MPG and get about 4 hours of driving on a full tank. Looking at getting a K&N Airfilter along with a PCR or something similar... any suggestions, ideas, or things to be cautious about? Thanks!
 

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2000 Xterra XE 4x4 3.3L AT
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Fresh plugs, wires, cap, clean the MAF, switch to all synthetic oil and lubricants, check the tire pressure weekly, try and keep the RPM’s under 2500.

It’s a 5000 lb plus SUV with the aerodynamics of a brick and between 170 to 200 HP at the crank. Mine barely got 18 when it was brand new.
 

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2004 Xterra XE 4WD Auto 3.3L NA V6
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I drove my 2004 3.3L NA home after buying it almost 800 miles away. I found that driving at 65-70 netted me 18.0 mpg, 60 netted 21.2 mpg, and mixed 60-70 netted 19.7, with all that data in the thread below.

Like @RacerXXL mentions, make sure it's in its best running condition possible, then use the cruise control.

 

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Maybe check to see that your brakes are NOT being partially engaged by a faulty ABS module? I was getting about 12-13 mpg, with N/A engine and auto on 33x12.50s. Now, since I S-canned the module, I'm to around 16-17 mpg. MAJOR difference in the way that the "X" feels, as well- feels MUCH "lighter" when moving, where before it had always felt "heavy" or sluggish.
 

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don’t forget the in line fuel filter underneath. I didn’t think I had one since most vehicles are designed with the filter in the tank. Changed mine and made quite a difference in power and fuel mileage.
 

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Fresh plugs, wires, cap, clean the MAF, switch to all synthetic oil and lubricants, check the tire pressure weekly, try and keep the RPM’s under 2500.

It’s a 5000 lb plus SUV with the aerodynamics of a brick and between 170 to 200 HP at the crank. Mine barely got 18 when it was brand new.
Lol. When I bought my 04 X from the dealer the salesman told me to keep the RPMs under 2500. At 2700 and above, it will suck that fuel like a full size truck. Told me after I signed the papers. 😳
 

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Yeah, it REALLY will get thirsty in a hurry! 2700 down the Interstate and the gas hand moves almost visibly while you watch it... 47 miles to work eats fuel fairly quickly...
 

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Maybe check to see that your brakes are NOT being partially engaged by a faulty ABS module? I was getting about 12-13 mpg, with N/A engine and auto on 33x12.50s. Now, since I S-canned the module, I'm to around 16-17 mpg. MAJOR difference in the way that the "X" feels, as well- feels MUCH "lighter" when moving, where before it had always felt "heavy" or sluggish.
What is S-canning the module and how do i do this"? is there a thread you can direct me to kind sir. My brick gets horrible mileage.
 
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