XJMichael

Any ideas how I can boost my gas mileage?

I have a 4 1/2 inch lift on 32s And It's my daily driver and it's killing me how much I go to the pump any suggestions?

BP88

Tornado helps me out. I assume great air intake and proper tire pressure is the best medicine. I would like o see what others say to this.

DougyFresh

Our XJ averaged 18.1mpg on a trip to Louisville at speeds varying from 60-80 (cruise doesn't work) it has 235/75's though. Sure beats the 12-14mpg i see people saying they get though. It has nothing done to it that would help the mileage and its hilly all the way there and all the way back. I'm about to build a snorkel for it using a Ford Windstar airbox and will be putting a more free flowing exhaust on it as well which should help a bit.

XJMichael

Oh okay I figured the air intake as well
Ill clean it out, maybe replace it.
Thanks

Tom95YJ

I just got 18.8mpg (GPS confirmed) on my way to and from Moab with my XJ loaded down with tools, cooler full of ice and food, 4 adults and a toddler, along with 2 bags with clothes and stuff , I am running 33's w/ 3.55 gears . It's all about maintaining your vehicle I am sure once I regear I'll get 20-22mpg on the hiway

s346k

the lift and tires are both increasing drag. mechanical and wind both.

my stock xj is getting 22-23 mixed city/highway driving. honestly I wouldn't be surprised to see it over 24 all highway. it spends a lot of time in the converter now. only a cpl hundred a week on the highway.

normal maintenance stuff. make sure everything is up to snuff. air filter, plugs wires etc. proper tire pressure.

DenaliRanger1

22-24 mpg .. holy smokes. I'd say I get about 15 mpg on a good day. Thats on 30's. I drive a mountain pass to go to work but 24mpg.. wow!

ta2tony

On stock gears? Putting 3.90's or 4.10's under it would help a lot. Intake/exhaust are going to provide minimal gains.

jamorrowxj

Regear, cold air intake, heat wrapped headers, tire pressure, proper alignment, throttle body mod. It's an xj so it's not good on gas lol, you can try to spend money to make your mpg's better to see if it pays for it in saved gas but that depends on how long you own it. I daily drive mine with big ol 35s and 4.88s and I get about 17mpg plus a cold air intake (basically just sounds cool lol).

OttawaXJ

Depends what you use your XJ for too, MPG is very important to me as I'm building an overlander. Our trips are mostly dirt roads until the camping location where we need the offroad ability of the XJ to get to the lake/river to camp on.

My last XJ got around 22mpg on 31" tires and a roof rack with 4 PIAA lights on top plus a heavy bumper.

Aljay

I just made an 800 mile trip and got 19 mpg driving the posted plus 5 mph .

Steel_Ninja

I'm hitting around 20 mpg on 31's, 4.10 gears almost all highway. I think the two biggest factors on gas millage are your driving habits and the upkeep on your vehicle. I have had this jeep for four months now, and first order of buisness was replacing ALL fluids with synthetic fluids. New plugs, wires, all filter. Free flowing air filter and free(er) flowing exhaust.

cleenrob

I'm getting between 15 and 18 mpg on a 3" 31s and stock gears.
Proper maintenence is a huge help as well as good driving habits

Nick-B

I'm surprised that no one has suggested new O2 sensors. Also check carefully for any vacuum leaks. Those are probably the 2 biggest culprits for poor mpg.

KG8893

If all you are worried about is how much you go to the pump you can make your tank accept more gas by changing the air vent. I've heard of people getting 22 gallons in it. I put 18 in mine the other day just by filling it really slow.

I get 14.5 Mpg. I dunno how accurate that is though cause my odo is wrong but I tried to correct it. I do have a vacuum leak though and don't drive too lightly.