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Old 12-04-2011, 09:23 PM   #61
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1994 2.5
235/75-15
average around 16-17 mpg mostly city driving. commute on freeway 25 miles round trip daily. City driving rest of the time.

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Old 12-05-2011, 08:01 PM   #62
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93
4.0 i6
33 tires
About 12 mpg

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Old 12-05-2011, 11:20 PM   #63
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1989
2.5L 4
30X9.50R15
4.10 gears

I averaged around 22-23 this summer (compensated for the speedo being off) and am averaging about 21.5 since it turned cold. This is mostly highway commuting at 55-65 indicated MPH.
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Old 12-06-2011, 07:14 AM   #64
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Quote:
Originally Posted by YJNick
1989
2.5L 4
30X9.50R15
4.10 gears

I averaged around 22-23 this summer (compensated for the speedo being off) and am averaging about 21.5 since it turned cold. This is mostly highway commuting at 55-65 indicated MPH.
Your speedo is off because of 30" tires? Didn't think compensation would be necessary until you go like 31"++? I run 235/75r15(29") and average 16mpg, am I actually getting 20+ with said compensation? And how does one figure out how to compensate for this exactly?
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Old 12-06-2011, 07:28 AM   #65
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Im pulling around 17 to 18 mpg
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Old 12-06-2011, 08:40 AM   #66
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1994 2.5 i4 5speed 4:10 32 inch at's
I get around 16 city and some where around 20 highway. Make sure you have you tires inflated properly for street use .
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Old 12-06-2011, 12:50 PM   #67
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95YJ 4.0 MT / 4:10 gears / 8.8 rear end/ SOA 33x12.5 MT

If I'm running 93 octane and just figure my road driving I get almost 14 MPG. Less with 87 octane, for some reason my Jeep hates 87 octane.

But of course if i figure in my off road wheeling time probly less than 10...
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Old 12-06-2011, 05:11 PM   #68
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95 YJ 2.5 Auto 30x9.5 no lift new everything (exhaust, plugs, wires, etc...) no top, no doors

13.5-15 mpg
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Old 12-06-2011, 05:20 PM   #69
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1988 YJ, 4.2L. With 31" BFG Mud Terrains I'm getting 16 on the highway and close to 14 in to town.
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Old 12-06-2011, 05:35 PM   #70
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94 YJ/ 4.6L Stroker w/ intake, 68mm TB, EF, Borla Header, & 2.5" exhaust.
37" IROK's w/ D44 Front & D60 Rear.

I average 14.5 mpg with premium in city and freeway.
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Old 12-06-2011, 06:42 PM   #71
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1993 2.5 5 speed manual, stock gears on 33" gumbos I'm getting 14-15 mpg in city, don't go onthe highway, too many 40-60 mph gusts lately
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Old 12-06-2011, 06:50 PM   #72
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Quote:
Originally Posted by NW_YJ
94 YJ/ 4.6L Stroker w/ intake, 68mm TB, EF, Borla Header, & 2.5" exhaust.
37" IROK's w/ D44 Front & D60 Rear.

I average 14.5 mpg with premium in city and freeway.
& 5.13's and a 5 speed.
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Old 12-06-2011, 08:05 PM   #73
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18 mpg running 33's 4:10 gears with 4.0 and NV3550 stick shift tranny. Have a snorkel and no other engine mods. And yes it pisses my friends off lol
Now 4.0 that is fresh .30 over and running 35's with 4:56 gears still getting 18mpg.
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Old 01-10-2012, 03:04 PM   #74
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92 I6 manual
Had it about 4 weeks now, 3 fills and getting 24mpg
Makes me think something is seriously wrong...
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Old 01-10-2012, 03:45 PM   #75
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93 4cyl 5 speed, 31/10.5 a/t with 4.10 gears, all stock but flow master exhaust (prior owner) , get 24 hwy and 20 street, speedo is off by 1/10th mile so might be a little higher, I get alot of jealous looks due to my high numbers from my jeep friends... Hahaha
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Old 01-10-2012, 04:04 PM   #76
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1988, sb 350, 4:10's 35' tires dana 44 front 14 bolt full float rear auto full time transfer case 5-6 mpg
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Old 01-10-2012, 04:49 PM   #77
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4.7L stroker with D30/44 combo 4.56 gears and 37 12.50 16.5R I get around 14 hwy and 12 city
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Old 01-18-2012, 10:27 PM   #78
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Quote:
Originally Posted by crtaylor View Post
95 ,2.5 5spd
15 mpg
31s
this is great when I got it ,only got 10mpg
What did you do to improve the mpg?
we have a 95 2.5 auto 31s only get 9-10
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Old 01-19-2012, 12:29 PM   #79
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'91 4.0
12 mpg
32in BFG's
I can get 13 if I really baby it and I don't drive in town very much.
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Old 01-19-2012, 12:33 PM   #80
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Quote:
Originally Posted by MYKIDS95YJ View Post
What did you do to improve the mpg?
we have a 95 2.5 auto 31s only get 9-10
FULL tuneup, make sure your exhaust isn't leaking, bolts are all tight, new injector o-rings, etc.

Tuneup list:

Fuel Filter
Cap
Rotor
Plugs
Plug Wires (all 5)
If original coil, then might want to replace with a new one.
Air filter
Injector cleaner in tank
Check for any vacuum leaks
Replace O2 sensor
Replace MAF
New coolant
Oil change
Clean throttle body/throttle body components

And for the pre 1991 MPFI Jeeps:

PCV valve
Ventilation Breather Filter

Of course you might want to go through and re-do your vacuum lines throughout.

Otherwise, the 2.5L 3 speed auto is a horrible combination and isn't fuel efficient at all.

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