MPG tips - Page 3 - JeepForum.com
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post #31 of 54 Old 02-07-2013, 06:15 AM
Octotat
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1995 ZJ 
 
Join Date: Oct 2012
Location: Chattanooga
Posts: 61
Bought my bone stock zj with 4.0L. Did a tune up and was able to get 21mpg on my commute (mostly highway, 90 mile round trip).

Added 2' lift, 31x 10.50 ATs, a 110 lb winch bumper, 80lb winch and I now get 16 mpg.

Of course I have a steel gas tank skid plate, and a new steel rear bumper which should an additional 150lbs, so I'm sure my mpg will drop just as fuel $ go up

Of course, I could try to get my VW Diesel Jetta back from my wife to get my 42mpg, but that would require buying her a new car which really isn't going to save me money in the long run

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post #32 of 54 Old 02-07-2013, 07:30 AM
patriotmfd
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2002 WJ 
 
Join Date: Jan 2011
Location: Brick
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all good except the seafoam ??? how does it work will all that smoke clog my cats ??? someone educate me please .... i have a can in the garage but hesitant on using it because i don't believe in magaic
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post #33 of 54 Old 02-08-2013, 09:02 AM
Octotat
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1995 ZJ 
 
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All the Seafoam is is a solvent to help remove carbon and gunk buildup in the throttle body and intake. My rig ran noticeably smoother after doing the treatment. I didn't do a before/after mpg test though.
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post #34 of 54 Old 02-08-2013, 11:40 AM
04Xrook
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I can't agree more. Driving under 60, preferably around 55, my TJ gets about 24mpg (4.0, 5spd, 24 if I'm alone, 23 if the wife and kids are with me). At 65 mph on the interstate my mpg drops to 20-21. Of course around town I get 19-20. These are just blocky vehicles. Slower speed helps a lot, both in wind resistance and rpm range. I was really surprised as to the difference and only noticed it when my company moved another 15 miles away, forcing me to take highways to work.



You get over 20 mpg? I'm lucky if I get 20 on a 55mph road w no stoplights an 10 miles of downhill. Around town 14-17. Stock 4.0 5spd
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post #35 of 54 Old 02-08-2013, 11:44 AM
04Xrook
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.
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post #36 of 54 Old 02-10-2013, 05:55 PM
PReinie
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2000 WJ 
 
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Location: Northbrook
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Many of your suggestions are included here except he uses acetone: http://blip.tv/KipkayVideos/how-to-d...ileage-4414239
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post #37 of 54 Old 02-11-2013, 12:38 PM
jesse12801
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1999 XJ Cherokee 
 
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Location: glens falls
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Seafoam in the oil? Won't that cause an over fill?
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post #38 of 54 Old 02-11-2013, 12:48 PM
XJNKY
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1998 XJ Cherokee 
 
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Quote:
Originally Posted by jesse12801 View Post
Seafoam in the oil? Won't that cause an over fill?
Not if you leave room for it... You don't put much in in the first place. Chances are, unless you continuously top off your oil, you're going to have a little bit of room in the "safe" zone on the dipstick anyway. If it's the first time you're doing it, I recommend doing it 50-100 miles before your next oil change. I've seen it break some pretty disgusting particles loose in the oil before, and you don't want that stuff circulating too much.
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post #39 of 54 Old 02-11-2013, 01:00 PM
XJNKY
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Quote:
Originally Posted by markcap View Post
Sorry, this thread cracks me up...you are driving a straight 6 292ci Jeep. Fuel economy is horrible no matter how you drive. I can't beat 15mpg with typical grocery getting type driving. Think I saw 19mpg on a long trip. A straight six is not a fuel efficient motor. It ought to have been designed a diesel.
Where did you manage for find a 292ci Jeep engine? Did you perhaps rob it out of an old Chevy?

Also, the idea that a straight 6 cannot be fuel efficient cracks me up. The Jeep straight 6's are torque-strong (you know, the same way diesels get good gas mileage if that's what they're set up for, read: TDI's).

Point being, Jeeps get bad gas mileage because of aerodynamics, and gearing, not because a straight 6 is inherently inefficient. If Chrysler had invested the money into properly updating the 4.0 in 2000 instead of just crapping up the design with bad pistons and weak heads, maybe given it a slightly longer stroke, 4v/cylinder, and an overhead cam, they probably would have moved to the upper 20's (or better) with MPG's. Look at Nissan and Toyota, and their straight 6's. They're not fuel sippers, but if you look at the power they're putting out, it's not a bad ratio.

Although you're right... they should just be giving us diesels.
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post #40 of 54 Old 02-12-2013, 10:59 AM
DirtRider1357
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2005 LJ Wrangler 
 
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Im not sure if this is true for the 4.0s but a lot of newer motors shut off the fuel when coasting down hill. so the same priniciple could be applied when downshifting to brake.

87 YJ, 4.0L, 5speed......sold, 05 LJ Rubicon
"It'll buff out"
"If it moves and shouldn't, use Duct Tape & Zip Ties. If it doesn't move and should, use WD-40 & A hammer"
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post #41 of 54 Old 02-14-2013, 04:17 PM
ToothlessJoe
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2001 TJ Wrangler 
 
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Quote:
Originally Posted by mKosel View Post
drive like a grandma, thats what i do!
+1
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post #42 of 54 Old 05-22-2013, 08:45 PM
woodyoakes
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So lift kits and 35s are bad?
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post #43 of 54 Old 05-22-2013, 09:02 PM
petegall79
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2006 TJ Wrangler 
 
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Location: Southern NH
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Quote:
Originally Posted by woodyoakes View Post
So lift kits and 35s are bad?
On a Honda, yeah, they're pretty bad.

Oh wait, you're talking about on a jeep? really?
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post #44 of 54 Old 05-23-2013, 04:57 AM
markcap
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2000 XJ Cherokee 
 
Join Date: Mar 2004
Location: Lehighton, PA
Posts: 29
Quote:
Originally Posted by XJNKY View Post

Where did you manage for find a 292ci Jeep engine? Did you perhaps rob it out of an old Chevy?

Also, the idea that a straight 6 cannot be fuel efficient cracks me up. The Jeep straight 6's are torque-strong (you know, the same way diesels get good gas mileage if that's what they're set up for, read: TDI's).

Point being, Jeeps get bad gas mileage because of aerodynamics, and gearing, not because a straight 6 is inherently inefficient. If Chrysler had invested the money into properly updating the 4.0 in 2000 instead of just crapping up the design with bad pistons and weak heads, maybe given it a slightly longer stroke, 4v/cylinder, and an overhead cam, they probably would have moved to the upper 20's (or better) with MPG's. Look at Nissan and Toyota, and their straight 6's. They're not fuel sippers, but if you look at the power they're putting out, it's not a bad ratio.

Although you're right... they should just be giving us diesels.
I should of wrote 242 ci. No I didn rob an old chevy. But good one though!

It is hard to believe all of the statements from drivers seeing better than 20 mpg. Mine is all stock with the factory tow package. I see 15 mpg for everyday short trip type driving.
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post #45 of 54 Old 05-24-2013, 08:30 AM
jesse12801
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1999 XJ Cherokee 
 
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Location: glens falls
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Can a 2007 GC AWD laredo run on 93 octane or is it only geared for 87??Where does the seafoam go?In the tank?
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