MPG with 3.7 and manual trans???

dieseldave · **Posted:** Thu May 12, 2011 1:20 am

I took a look at a couple of KJ's ('03 & '06) with a 3.7 and manual trans. What kind of real world MPG numbers can be seen with this combo?

Thanks,
Dave

SweepnChoke · **Posted:** Thu May 12, 2011 8:02 am

3.7l 5pd manual

245/75/R16 - ARB Front Bumper - 3" lift - about 200lbs of gear in the back.

After doing my km to mile and L to G conversions, mine works out to 18mpg average. However I don't exactly drive in a manner that is..... say, fuel efficient.

hooperswish · **Posted:** Thu May 12, 2011 9:34 am

I get about 17 in the city, and about 20 on the hwy. I do have a mopar roof rack, but no lift or over sized tires.

Megalos · **Posted:** Thu May 12, 2011 9:37 am

I average about 16mpg. Probably all of the extra weight I add just by sitting in it!

Kdabbagh · **Posted:** Thu May 12, 2011 10:38 am

Currently stock with custom pvc cai running to the air box but not a k/n filter yet. I managed to get 18 mph with a light foot to and from work over half being highway. Normally 14 - 16 city depending on how heavy my foot is. Interstate driving is about 17-21 depending on cruising speed. 17 when averaging 78 mph on hilly / mountainous terrain.

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mtnclimbr · **Joined:** Thu Feb 03, 2011 3:36 am **Posts:** 15

I'm surprised these numbers are so low

I get 19-25 hwy in my auto depending on speed and whether there are hills. City is 13-18 obviously depends a lot on how i'm driving. Fully stock 3.7L 4x4. But shouldn't a manual do better?

Khaki-KJ · **Posted:** Fri May 20, 2011 5:24 am

Stock 3.7 with a 6 speed manual. I average 17mpg U.S. (21 mpg Canadian). I did not buy the Jeep for the great fuel economy, I bought it because I wanted one vehicle that I could use for both work and play, and it is the perfect vehicle for that.

Khaki-KJ · **Posted:** Fri May 20, 2011 5:36 am

mtnclimbr wrote:

I'm surprised these numbers are so low

I get 19-25 hwy in my auto depending on speed and whether there are hills. City is 13-18 obviously depends a lot on how i'm driving. Fully stock 3.7L 4x4. But shouldn't a manual do better?

If you drive a manual transmission like it is supposed to be driven, then you get better fuel economy than an automatic transmission. But manuals are just too much fun to drive normally.

sota · **Joined:** Fri Aug 07, 2009 7:44 pm **Posts:** 379

I get about 19mpg average with mostly in-town driving. but then i'm pretty sure my speedo and possibly my odometer are about 10% fast so... :oops:

kjon · **Posted:** Sat May 21, 2011 5:13 pm

pre-lift with factory tires I'd get 20-21 average.

frankenlifted with 245/75/16 BFG TA KO's on soft 8's - I'd get 16.5- 17.5 driving in North Dakota where the max speed limit is 75mph. Now that I'm living in Wisconsin again, where the max speed limit is 65mph, I was get 18-19 mpg. I actually got 19.98 out of the last tank.

Note, I also adjust my mileage for the increased tire circumference. it works out to (miles on spedo x 1.05555), or for every 18 miles my spedometer says, I've actually driven 19 miles.

kjon · **Posted:** Sat May 21, 2011 5:26 pm

Also, I just thought that I'd mention, although I'm sure others will interject their thoughts :roll:

... if you are really concerned about gas mileage, and are a die hard manual driver/jeep lover, my lady bought an '08 patriot 4wd with the five speed manual. She's gotten 28 mpg out of some tanks, and it's never been below 25mpg.

infernicus · **Posted:** Sat May 21, 2011 5:44 pm

2007 6 Speed - Lights on Cowl & 130w 8" ProComps - Full Skids - Rock Lizard Super Skink Sliders - Front Hitch
Frankenlifted - Al's A-Arms - General Grabber A/T2 31x10.5R15x7 Cragar D Window 4"bs

I get about 15mpg.
I drive about 50/50 city/highway.
Anything over 65mph I'm just wasting fuel.

Khaki-KJ · **Posted:** Sun May 22, 2011 1:06 am

infernicus wrote:

Anything over 65mph I'm just wasting fuel.

Funny you should write this. There are two ways I can take to go home from one of the places where I do a lot of work. One way is the freeway, which is a little shorter and fairly level, where the speeds are 70+ mph and the other way is back roads where there are several lights and hills and the average speed is 40 to 50 mph. The back roads are a little longer, but I get better mileage even with all the lights, hills and extra traffic. As long as I keep under 65 mph I get decent (for a Jeep) mileage, anything over 65 and my mileage noticably suffers.

Another thing I have noticed is that my city and highway mileage numbers are very close to each other. My mother has a Jeep with an automatic and her city mileage is noticably worse than mine. I guess with the low end torque combined with the gearing (3.55) for the manuals, they do not have to work too hard in the city.

Sukpad89 · **Posted:** Sun May 22, 2011 6:17 pm

I have a completly stock 05 3.7 with the 6 speed. I get about 15-17 city 19-21 combined and 24-26 all highway doing the speed limit and shifting out between 2-3.5k depending on how I need to drive. BTW I only have 29k miles on mine so if your looking at vehicles above 75k you should expect them to do a little less because of wear. I also never do more than 5 over and everyone beats me at red lights because I drive conciously overlooking the MPG. I'm a broke college student and drive almost 100 miles a day os every mile I can sqeeze out of a gallon is very important. Combined driving I get 360 miles untill I am at the last 8th of a tank and I get about 400 all highways at the same point which is between 16-17 gallons used. Hope this helps.

dieseldave · **Posted:** Mon May 23, 2011 1:32 am

Thanks for all the input! I sold my CRD about a year ago to eliminate a monthly payment. Then, I took the equity and bought a PT Cruiser. The problem is that it's a bit small for me. I need to get back into a Liberty as long as I feel that I can acheive approximately the same MPG's. I only get about 20 MPG (PT) for mostly suburban driving, so it almost seems possible.

Thanks again,
Dave

Sukpad89 · **Posted:** Mon May 23, 2011 9:41 am

The gasser libbys get good milage for a medium sized SUV. The standard tranny really helps. I can't do better than 17 MPG with my GF's 04 renny 3.7 auto. The stick is the way to go. PT's have really bad reasale so I wish you luck on getting that thing turned back to a libby. BTW my 98 Wrangler 2.5|4 5-Speed with 31" tires and 2" Lift and 120k miles got 21mpg highway/16ish city. My 3.7 bigger, heavier, newer jeep I would never trade and go back to my old wrangler. There is just something about jeeps, you can leave for now, but you will always come back!

broncsrule · **Posted:** Mon May 23, 2011 1:30 pm

about 18 around town...

SavageUrge · **Posted:** Mon May 30, 2011 1:43 am

My '03 Renny 5-Speed is bone stock and I average 18-19mpg during the spring/summer. My best mileage being 21.8 on a 3 hour trip back from the Adirondacks. averaging about 70 MPH. During the winter I'll average about 16.2mpg. It really takes a hit between the "winter gas", idling to let it warm up and the driving conditions in and out of 4x4.

Knightrider03m · **Posted:** Mon May 30, 2011 6:25 am

You manual transmission guys have all the fun. It sucks that Jeep took it out of the Liberty before I was able to get mine

sota · **Joined:** Fri Aug 07, 2009 7:44 pm **Posts:** 379

get a used one.
just don't get an 07. my ECU is definitely NOT pleased sometimes with the 6spd being behind the engine. :furious:

MPG with 3.7 and manual trans???

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