I Increased My XJ Gas Mileage To Over 20 MPG

[red91]

i was reading this, got really excited, and then realized my 2000 doesnt get a new distributor or wires because its all a rail that cost $$$$$ to replace, im very happy you have to replace all that stuff

what he doesn't mention is that he's running 215/75/R15's.

 

[Big Kev]

Ok, i have a 99 with 31s and i just moved to colorado. My milage in michigan was 15ish and now i am getting around 21. I switched to premium when i pulled the trailer out here, i tried a tank of the 85 oct and the milage and acceration was horrible so i have just been doing premium and everything is great. i might have to do a tune up soon, its due, maybe i will get over 30... probably not....

 

[flyingphil]

I put a TB spacer, a banks header, high flow cat plus a IMCO(it's got baffles like a flowmaster but not quite the same sound) muffler and got an increase of about 5 MPG lifted 2 and a half inches running 30 inch M/T's. I would get more, but I just can't get my foot off the gas pedal long enough to... Oh crap, who am I trying to kid here. I like the new grunt out of my inline 6. It makes it jump out of the mud holes and scares the ricers when I gun-it. Hehehe.............


Phil

 

[lrsmithwhaley]

but I just can't get my foot off the gas pedal long enough to... Oh crap, who am I trying to kid here. I like the new grunt out of my inline 6. It makes it jump out of the mud holes and scares the ricers when I gun-it. Hehehe.............


Phil

Same with running no muffler.

 

[xjtrailrider]

I've started running 93 octane to get rid of det/pre-ig. and now I'm getting about 60 more miles out of a tank of gas. so the extra cost of the fuel actually, almost equals out in the end, but with more power when needed and no det/pre-ig.

 

[djblade311]

I farted one time and it increased my speed by about 10 MPH.

:roflmao:

assgas:

 

[53guy]

wow, how impressive. you increased your gas mileage by replacing all the old stuff in your jeep? hmmm, I'll have to consider that when I do my next tune up.......and to think, all these years I've just been cleaning and reusing my plugs and distributer. or maybe my crappy mileage comes from being nearly a foot higher in the air and the overly large 35 inch tall tires making a barn move down the highway at around 80mph....

 

[Gnat5680]

i think i will do all that just to get a few more mpg in a jeep that was built to not get good gas milage.

by the way i see you don't post here much and you recently joined. so i think i will be the nice one and say.


WELCOME TO !!!



P.S. post 123! its sequential

 

[Red97XJ]

glad you are saving gas...

 

[Dvipercop]

Same with running no muffler.

x2. The easiest, cheapest way to get a better sounding rig. Been told mine sounds like it's running a 40 series.

 

[stlouisboy63]

Well you guys think it's funny for me to share my success. I've done a stock parts tune up before on my xj and continued to get the stock gas mileage of 15mpg. I just thought you guys might be interested in the results of just spending a few extra bucks. By the way I didn't need to increase the octane on the gas. I was still going over 20mpg using 87.

 

[partyncwby]

That's right, guys! Kill the guy for sharing. Way to go.


Hey man, good job on the wiring upgrade and finding the best parts you could at a good price too. Kudo's.

 

[raypla]

I farted one time and it increased my speed by about 10 MPH. assgas:

Lol thats hilarious :laugh2:

Good job
I too am looking forward to upgrading my wiring and noticed an increase in MPG with the rest of tune up stuff I did. :repair:

My XJ still had the stock plugs and wires w/110,000. Talk about a serious plug gap, the plugs were wore to where the electrode was at the porcelin.

 

[goodburbon]

You'd probably do even better with stock style plugs in there, the jeep engine doesn't like the platinums too much, especially the multi-spark units.

 

[lrsmithwhaley]

x2. The easiest, cheapest way to get a better sounding rig. Been told mine sounds like it's running a 40 series.

The only downside is I keep getting flipped off, by chicks talking on their cell phone with their window down as I accelerate past them.

 

[Gerr]

I get 19 mpg on 87 octane and 22 mpg on 91. congrats on a good tune up but umm come see what you get driving the 15 north on the big hill every day. My biggest increase came from a tried and true method .... not speeding

 

[Mr.OverKill]

i am rocken a killer never before seen milage of 7 per gallon + or - 2 miles with the chevey small block mercury boat motor out of my dads boat ( he got a 500 hp aluminium one to replace this 350 hp steel one ) but i can set off car alarms without farting assgas: and smoke the 35" mt's ( front and rear ) on dry pavement and i only run 87 octain, can you imagin that?:confused1


on the serrious side, that sounds like a good tune up and we all should be as thourough as you were and i never really thought about the wireing helping that much, i think i may do some rewireing of my own.

 

[Dvipercop]

The only downside is I keep getting flipped off, by chicks talking on their cell phone with their window down as I accelerate past them.

That's a downside? I consider that part of the perks... along with setting off car alarms in parking garages.

 

[Ramsey]

x2. The easiest, cheapest way to get a better sounding rig. Been told mine sounds like it's running a 40 series.

people tell me mine sounds like ass, could be the giant crack all the way around the header though

 

[aaronh]

yea, a cracked header would sound like ass