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post #1 of 14 Old 05-23-2011, 09:27 PM Thread Starter
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2005 TJ Wrangler 
Join Date: Oct 2009
Location: Northern NJ
Posts: 12

What's the best mpg anyone had gotten in their IL6? manual or automatic?

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post #2 of 14 Old 05-24-2011, 07:48 AM
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1999 XJ Cherokee 
Join Date: Mar 2011
Location: Suffolk
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I haven't used MMO (mystery machine oil) to degunk my crankcase yet, my oil hasn't been changed in nearly 3200 miles, and I kinda dog it.
19 is the best fuel economy, 15 the worst (15 in the city in sweltering heat, stop and go traffic, and the engine was starting to get hot.)
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post #3 of 14 Old 05-24-2011, 07:54 AM
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1998 XJ Cherokee 
Join Date: Sep 2009
Location: Buffalo, NY
Posts: 517
you own a jeep. mpg's are kinda irrelevant, gallons per mile is more like it (at least it seems that way)

My Amber Fire XJ Project:
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post #4 of 14 Old 05-24-2011, 09:15 AM
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2002 WJ 
Join Date: May 2011
Location: NW Montana
Posts: 92
Agreed gallons per mile
Best mine ever got was 15 mpg on the road

Electronics Design & Repairs is my game
'02 WJ Overland, '03 TJ Rubicon & Factory DRBIII
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post #5 of 14 Old 05-24-2011, 07:04 PM
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2007 JK Wrangler 
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Location: Central
Posts: 10
My 2000 I6 2000 XJ got 18 mpg daily driver, and 22 on high way trips. Our "new" 2002 WJ 4.7 seems to be lucky to get 15.
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post #6 of 14 Old 06-19-2011, 08:05 AM
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1997 ZJ 
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Location: tucson
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so far my stock 97 GC gets 16.2 all city.
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post #7 of 14 Old 06-20-2011, 10:51 AM
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1996 XJ Cherokee 
Join Date: Oct 2004
Location: Mobile
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To my surprise, after putting a new headgasket, head, valves, etc. on a 4.0L in a '98 project XJ I'm currently working on for a friend, the gas mileage now reads on the OHC as being far better than in my '96.

My '96 doesn't have an OHC, but calculated at the pump, I usually get 17mpg city and 20mpg highway. That motor has run on nothing but synthetic blend oil and is pampered like a baby. The '98 had been overheated several times before I got hold of it and the headgasket had finally blown; after cleaning up the mess and getting it back on the road, the OHC says it gets 20mpg city and 23 to 24mpg highway. The speedometer is accurate and both XJs are running on OEM-spec size tires, but I'll have to do an at-the-pump calculation at some point to see if this is true.

24mpg on a 4.0L? Sounds too good to me, sadly.

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'96 XJ Country (pearl white) 2WD, 4.0L HO I6, AW4. Daily driver.
'98 XJ Classic (moss green) 2WD, 4.0L HO I6, AW4. Restoration project.

Gone, but not forgotten: '88 MJ Pioneer, '94 ZJ Limited, '85 CJ7, '98 ZJ Limited

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post #8 of 14 Old 06-27-2011, 03:18 PM
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Location: Redwood city
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I only average around 11 MPG in my 06 SRT8, but never drive it slow.
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post #9 of 14 Old 07-07-2011, 02:36 AM
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1999 XJ Cherokee 
Join Date: Jan 2009
Location: pittsburgh PA
Posts: 187
not enough.

1999 xj, bone stock-current
1998 xj, 2" on 33's-past
1994 yj on 31's-past
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post #10 of 14 Old 09-10-2011, 04:05 PM
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2002 TJ Wrangler 
Join Date: Aug 2010
Location: alabama
Posts: 22
16 mpg
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post #11 of 14 Old 09-18-2011, 09:34 AM
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2004 WJ 
Join Date: Feb 2011
Location: Bognor
Posts: 5,853
28-30mpg in everyday use and about 35-38 mpg on a longish journey (nowhere is that far in the UK!!) at 60-75mph. Best ever was 38.6 at a constant 50mph trying to prove that I could get 40 to the gallon out of it to a friend. Failed! I probably could now as I run higher tyre pressues these days! ................................oh did i mention it a 2.7CRD 5 cylinder diesel!!!

All quoted figures are measured tank top to tank top and not on the very optimistic overhead display!

Just as well.....fuel (Petrol or diesel) is over $10 a gallon over here so there is no way I could afford to run a petrol engined Grand.
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post #12 of 14 Old 09-23-2011, 04:17 PM
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1999 TJ Wrangler 
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Location: Felton
Posts: 3,483
99 I4 average 19 Mpg

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post #13 of 14 Old 10-09-2011, 08:31 PM
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2002 TJ Wrangler 
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Location: alabama
Posts: 22
02 sahara I6 auto; consistantly gets 16mpg in the deep south; I ran a full tank without running the AC; MPG went to 17.7.
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post #14 of 14 Old 10-16-2011, 04:16 PM
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1995 ZJ 
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Location: sartell
Posts: 42
95 Grand Cherokee, v8 5.2, I get around 11 in town, 13-15 highway. Most of my driving now is highway, but I am hoping to get that up a bit.

I think I need to replace the head gasket. I realize I am not goign to get really high mpg, but it would be nice to not have to fill up more than once a week. I have about a 70 mile round trip, mostly highway.

1995 Jeep Grand Cherokee ZJ
V8, 5.2 L
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