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Unread 08-23-2008, 01:13 AM   #1
powerplantboss
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how to improve fuel milage

i have a jeep cherokee country with the 4.0 6 cylinder with fuel injection, is there any modifications that i can do to it to improve the fuel milage as of right now i'm getting about 16.5 mile pre gallon of gas, that's driving on hyways at speeds of 65mph most of the time, i dont know what it gets in the city. ( by the way i'm not complaning about my jeep but i would like to a little better milage out of it )

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Unread 08-23-2008, 03:02 AM   #2
LCFRJEEP
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I hate to be the one to tell you this brother, but your XJ's MPG's are about "par for the coarse"!! These puppies arent naturally fuel efficient and they have the aerodynamics of a brick. If you wanna save fuel, stay out of the throttle, when your crusing at high way speeds, keep it down to a minimum. Make sure your rig has had a full tune up. Make sure your tires are up to optimal PSI. Get an open filter intake and an after market cat and muffler. Good Luck!!
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Unread 08-23-2008, 08:47 AM   #3
mecompco
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You should be able to do a bit better. Tune it up, keep tires inflated, keep stuff off the roof rack, remove excess weight, check your o2 sensor, and keep the RPMs under 2K and drive 55 on the highway. I'd bet you could see close to 20 on long trips.
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Unread 08-23-2008, 11:01 AM   #4
99Greenmachine
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SEAFOAM!!!! LOL

there are so many threads for this just do a search

but you said ur looking for mods...get a k&n and a snorkel.
change your oil regularly and keep it tuned up
dont run the a/c
keep your spare out of the jeep when running around town or on short trips
get an alignment, keep your tires prop. inflated
buy decent gas...make sure it isnt mixed w/ ethanol,
REGEAR,
bore out your throttle body
get a 6-speed out of '05 wrangler rubicon,
warn front hub conversion
cover your jeep in stickers...they add gas mileage lol

those are just a few mods you can do
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Unread 08-23-2008, 11:09 AM   #5
JeepitoErgoSum
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"Walk softly" on the pedals. BOTH of them! Accelerate slowly, coast before you stop, and don't pass or change speed rapidly; as much as you can. Driving habits will affect your MPG more than anything else. "You have to PAY to PLAY" is a universal truth!
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Unread 08-23-2008, 11:11 AM   #6
myriad360
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This thread has been done to death, but this go around I thought about the difference between my '88 and my '01 XJ's. We took the '01 on a road trip this summer, and we got 23 MPG on good gas (hard to find in freakin' Montana). The main difference with the '01 and earlier versions is that every plug has its own coil, technically. So when you look at the plug wires, it is actually just a bunch of signal and power wires; not your normal plug wires.

I guess the lesson here is that getting more spark to the plugs (efficiently) is going to get you more MPG. Now, on modding that in the earlier XJ's, that is an interesting mod.... but probably worthwhile. I wonder if anyone has done this specifically, or just done the normal ignition module mods.
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Unread 08-23-2008, 01:06 PM   #7
01sherman
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Quote:
I guess the lesson here is that getting more spark to the plugs (efficiently) is going to get you more MPG. Now, on modding that in the earlier XJ's, that is an interesting mod.... but probably worthwhile. I wonder if anyone has done this specifically, or just done the normal ignition module mod
converting is the easy part but finding the parts to do it is the hard, and id have to say for mileage ya tune up, tires, no ac, excess weight, remove mufflers and resonators, get high flow cats, snorkel or some form of fresh air into engine
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Unread 08-23-2008, 01:34 PM   #8
myriad360
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Cool, I am seeing snorkels mentioned a lot. That would be a good excuse to get one, but probably not my main use for it.
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2001 Jeep Cherokee 4.0 L Limited, White. Bought in Grangeville, ID 06/11/08. Stock everything.
1998 Jeep Wrangle 4.0 L, Green. Bought in Nampa, ID 02/21/09
1988 Jeep Cherokee 4.0 L, White. Bought in Vancouver, WA in 2003. 1st Jeep, White. Bought with 3" lift, added Pacesetter header and 40 series Flowmaster
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Unread 08-23-2008, 04:43 PM   #9
spdfrk78
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Check out this link for ideas and what results they will give. Also older XJ seems to get better mpg.
http://www.jpmagazine.com/projectbui...eep/index.html
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Unread 08-23-2008, 05:10 PM   #10
winkosmosis
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I went from 18 to 20 mpg mostly highway after I lifted 2" and got 31" tires. I think 31" and stock gears puts the engine in the sweet spot for 65mpg cruising.
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Unread 08-23-2008, 11:21 PM   #11
powerplantboss
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thanks for every body replying to my question on fuel milage i will do every thing you all have mentioned. i did not buy this jeep for milage i bought it to have fun with it and to drive it every day to work so that is the only reason i was asking. i owne a big F350 four wheel drive and it gives me about the same milage so i thought there was something out there that i needed to do to it. Any way i have had lots of fun driving it on the beach more then with my big truck. ( thanks again)
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Unread 08-23-2008, 11:42 PM   #12
powerplantboss
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fuel milage Thanks

thanks for every body replying to my question on fuel milage i will do every thing you all have mentioned. i did not buy this jeep for milage i bought it to have fun with it and to drive it every day to work so that is the only reason i was asking. i owne a big F350 four wheel drive and it gives me about the same milage so i thought there was something out there that i needed to do to it. Any way i have had lots of fun driving it on the beach more then with my big truck. ( thanks again):
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Unread 08-23-2008, 11:43 PM   #13
broncofire75
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Don't drive it.

Or SEARCH!

Lighter take offs, less lane changing that requires you to lean on the gas and stop sooner. Maybe will help one MPG.

Intake,exhaust, programmers all will help minimally but will pay for themselves eventually.
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