3.4L supercharger

If anyone has race gas in your town if do that. Just be sure it’s sensor safe.

 

I’m pretty consistent at 20 mpg highway 5 speed.

 

I just purchased new up and downstream sensors ill see if it helps the current sensors have about 230k miles on them

 

At one time i was getting about 250 per tank. Now im lucky to get 130.

 

Ooof, That's a drastic decrease! Most I ever got was 220 out of a tank. But, that old engine and trans were very tired; hoping to see moderate increase in range with the refreshed engine and rebuilt trans.

 

Well I feel better now lol. When I first got my truck, it was all stock and supercharged. I actually got over 300 to a tank all highway once.

Now, with the steel armor/bumpers/bed rack/tent/33" tires...I'm lucky to break 180 miles to a tank. I also do mostly in-town commuting too though.

130 is pretty bad, what size tires are you running? Any extra weight elsewhere? Sounds like you might wanna start with a fresh tune up and go from there. Do you have a scan tool to read fuel trims?

 

I was going to suggest the O2s, that's a good idea. Clean the MAF too with MAF cleaner

 

i am running 33" tires with rock sliders, and a decently weighted front steel offroad bumper.

 

My tires are 80pb a piece, don’t run a skid right now, and I’m lifted 2”. I’m sure if I was closer to stock I could close that gap

 

im running a 2" pully urd 7th injector setup and seeing 12-13mpg on really hard mountain driving 2000 ft -6000 ft elevation with lots of full throttle "driving like i stole it" the whole tank of fuel.. I did a trip from the central valley of california up through yosemite park into nevada and got almost 19 mpg on that mountain drive. if your getting 10 something is wrong

 

fill with 93 and boost that octane. if it does not smell like varnish you are fine

 

What size tires? In my experience that's the biggest factor in mpgs on these trucks unless you're fully decked out in armor. Weight at the wheels has a dramatic effect on fuel mileage, not to mention the difference in calculation due to larger tire size if that's the case.

Although 10 mpg is certainly pointing to something else other than tires for sure.

 

Ahh ok i dropped off a set of injectors to ger serviced and i have new exhaust sensors in route. Ill clean the maf sensor and swap air filter

 

How new are the plugs/wires? The cooler Iridium plugs that most of us use should last a lot longer than the OEM copper ones but I still wouldn't run them to 100k like they advertise

 

I have about 20k miles on the urd plugs that came with the 7th injector. The wires idk i would say 70k miles on them. Do u think i should replace wires

Engine has a total of like 75k miles it was a jdm im

 

something is definitely wrong. I would start with replacing the fuel pressure regulator then maybe your wideband 02 sensor and clean your maf. I had to replace my throttlebody the throttle position sensor wasn't communicating with the cable sensor on the otherside

 

the ruthenium FR7's are awesome a step up from the iridiums

 

Part numbers?

 

2” pulley and 7th? Didn’t you say you haven’t tuned the 7th injector?

Out of curiosity what are your AFRs WOT?

 

Curious what exhaust are u guys running when i had stock i could feel the torque pretty bad and it was nice. I swapped to a high end overland magnaflow and it isnt the same feel anymore.