258 fuel economy - JeepForum.com

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post #1 of 16 Old 07-10-2004, 02:54 PM Thread Starter
eprobe
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258 fuel economy

I'm interested in what kind of fuel economy people out there are getting w/ their 232/258s. I get about 15 mpg w/ a 1bbl Carter on a 232 w/ 3.31 gears and 31.5" tires. Does anybody's Jeep do better and what did you have to do to achieve that? I'm particularly interested in people who may have swapped heads w/ a 4.0 or added EFI or TFI or an HEI.

Thanks,

Eric

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post #2 of 16 Old 07-10-2004, 06:06 PM
jeepsarecool
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I get 14.5 mpg with 33" tires and a Weber 38. Not sure about my gears.

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post #3 of 16 Old 07-10-2004, 07:13 PM
djfuzzy
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I figure I get about 17mpg - but....all of my guages are out of whack except for my odometer so I don't really know.

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post #4 of 16 Old 07-11-2004, 10:10 AM
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With the MPI kit, 31" 5-speed, and 3.31, I get over 20 mpg, close to 25 at times, on the highway, if you can beleive that. That's really the only time I calculate it.

'82 Scrambler - NV4500/4.5" lift/33" Toyo MTs/4.0/twin stick, and my windshield washers work! Full 1/2 cab Cage

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post #5 of 16 Old 07-11-2004, 10:48 AM
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Between 15 and 18 depending on type of driving with 4.10 gears, 31" tires and 5 speed trans.

1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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post #6 of 16 Old 07-11-2004, 11:34 AM
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Mine is a 80 CJ-5 with 4.10 gears 31 inch tires and a T-176. I haven't corrected the speedo since installing the 4.10s. Mileage is lousy ...probably about 12-13 mpg. I used to get between 15 and 17 with the old 3.54 gears.
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post #7 of 16 Old 07-11-2004, 12:10 PM
SamFromCO
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'86 CJ7, 258 w/Mopar MPI kit, 5 speed transmission, 35" tires, 4.56 gears=20 mpg highway (I seldom drive it around town so I don't know about that)

'86 CJ7, 258 w/Mopar MPI, 4.56 gears, rear Detroit/front Truetrac, full cage, OBA, 8274, 4" lift via Alcans/Rancho, 35's on beadlocks, other stuff. Built for rocks, mud is a four letter word.
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post #8 of 16 Old 07-11-2004, 12:55 PM
jeepsarecool
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Quote:
Originally Posted by SamFromCO
'86 CJ7, 258 w/Mopar MPI kit, 5 speed transmission, 35" tires, 4.56 gears=20 mpg highway (I seldom drive it around town so I don't know about that)
20 mpg???? Are you suuuure about that?

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post #9 of 16 Old 07-11-2004, 03:47 PM
OL YELLAH
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14-15 mpg with the engine mods listed below, 3-speed, and 3.73 gears. That's pretty much all highway driving.

1979 Jeep CJ-5; 1972 258 (Pacesetter Header, Weber Carb, Wrangler Aluminum Intake, 2.5" Exhaust Straight Through w/ Thrush Mufflers); 2.5" BDS Lift; 1" Daystar Body Lift, Herculiner; RJS Belts; 33" Interco Trxus M/T Tires; Xtreme Alloy Wheels; 2.5" Perfomance Wheel Spacers; TFI Upgrade.
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post #10 of 16 Old 07-11-2004, 05:40 PM
SamFromCO
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Quote:
Originally Posted by jeepsarecool
20 mpg???? Are you suuuure about that?
Yep, I've checked it several times. And, if you found that hard to believe you'll probably have a harder time with this, that's over the mountains. About the only time that I ever really check mileage is on my trips from Denver to Moab and back. I believe that my odometer is pretty close and have checked it several times with my GPS. Also I roughly know the distance between gas stops. 19-20 mpg! The only catch is that I have to run premium unleaded to keep the motor from pinging.

'86 CJ7, 258 w/Mopar MPI, 4.56 gears, rear Detroit/front Truetrac, full cage, OBA, 8274, 4" lift via Alcans/Rancho, 35's on beadlocks, other stuff. Built for rocks, mud is a four letter word.
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post #11 of 16 Old 07-11-2004, 09:28 PM
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Quote:
Originally Posted by jeepsarecool
Not sure about my gears.

Any idea what rear axle you have?

1982 CJ7
Iron Duke "Hurricane" 151 CID 2.5L 4-Cyl
T177 Tranny | Dana 300 T-Case
Dana 30 Front | AMC 20 Rear
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post #12 of 16 Old 07-12-2004, 10:16 AM
jeepsarecool
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Quote:
Originally Posted by Aphelion79
Any idea what rear axle you have?

Yeah, I have the AMC 20 rear.

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post #13 of 16 Old 07-12-2004, 05:19 PM
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Quote:
Originally Posted by jeepsarecool
Yeah, I have the AMC 20 rear.
To find your gear ratios (if stock and no one has done any upgrades etc) look at the rear of your 20

Rear View
Driver's Side (|)---=(+)=---(|) Passenger's Side

The right most = sign is the edge of the pumpkin that has either one letter or two letters sticking out of it. This is right where the axle tub fits into the differential. The letter(s) represent the current gearing from the factory.

Code:
'81 and earlier CJs
Narrow Track AMC 20  
Code  Gear Ratio  Diff Type  
AA  2.73  Open 
DD  2.73  Trac-Lok 
BB  3.31  Open 
CC  3.31  Trac-Lok 
A  3.54  Open 
N  3.54  Trac-Lok 
GG  3.73  Open 
Q  3.73  Trac-Lok 
L  4.10  Open 
M  4.10  Trac-Lok 


'82 up CJs
Wide Track AMC 20  
Code  Gear Ratio  Diff Type  
D  2.73  Open 
DD  2.73  Trac-Lok 
B  3.31  Open 
BB  3.31  Trac-Lok 
A  3.54  Open 
AA  3.54  Trac-Lok 
H  3.73  Open 
HH  3.73  Trac-Lok 
C  4.10  Open 
CC  4.10  Trac-Lok
Mine had a single "A" sticking out (not stamped INTO the metal) showing 3.54 gearing with Open differentials (no limited slip).

1982 CJ7
Iron Duke "Hurricane" 151 CID 2.5L 4-Cyl
T177 Tranny | Dana 300 T-Case
Dana 30 Front | AMC 20 Rear
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post #14 of 16 Old 07-13-2004, 10:18 AM
jeepsarecool
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'82 up CJs
Wide Track AMC 20
Code Gear Ratio Diff Type
D 2.73 Open
DD 2.73 Trac-Lok
B 3.31 Open
BB 3.31 Trac-Lok
A 3.54 Open
AA 3.54 Trac-Lok
H 3.73 Open
HH 3.73 Trac-Lok
C 4.10 Open
CC 4.10 Trac-Lok





Hey, thanks for the info. I went out and checked, and if it is stock (and I'm fairly sure it is), I have the 3.31 open gears. Is that a good gear ratio? It seems to work ok with my T5 and 33" tires.

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post #15 of 16 Old 07-13-2004, 10:22 AM
Aphelion79
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Quote:
Originally Posted by jeepsarecool
Hey, thanks for the info. I went out and checked, and if it is stock (and I'm fairly sure it is), I have the 3.31 open gears. Is that a good gear ratio? It seems to work ok with my T5 and 33" tires.
Well concidering its a final drive ratio it all kinda depends on what else you have... tranny, transfer case ratios .... tire size, and what you plan on doing with it... For me... I could stick with my Dana 300 and reduce it to 4:1 low and still have my high range that will work with my 4 spd on the highway... I'm not entirely too sure how well that would work... but with my 4 banger i shouldnt be able to beef out that much stress anyway lol...

1982 CJ7
Iron Duke "Hurricane" 151 CID 2.5L 4-Cyl
T177 Tranny | Dana 300 T-Case
Dana 30 Front | AMC 20 Rear
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