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Unread 03-17-2012, 12:05 PM   #1
bigjeep39
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2004 WJ 
 
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2012 KK Lemon?

I posted a while back about our new 2012 liberty. We were curious on gas mileage and some said they got up to 18mpg

Well we have filled up 2 times and each time we get 12 mpg to 14 mpg tops. What is wrong with our liberty?? Not a happy owner at all

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Unread 03-17-2012, 12:38 PM   #2
Dave_B
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Break it in! I get 18 1/2 combined and up to 23 1/2 Hwy. It will get better at 5,000or so.

Dave
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Unread 03-17-2012, 06:13 PM   #3
tjkj2002
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Quote:
Originally Posted by bigjeep39 View Post
I posted a while back about our new 2012 liberty. We were curious on gas mileage and some said they got up to 18mpg

Well we have filled up 2 times and each time we get 12 mpg to 14 mpg tops. What is wrong with our liberty?? Not a happy owner at all
Yeah your going to have to wait about 5000-10,000 miles beofre you will get anything close to 18mpg's.It's called engine break in.
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Unread 03-17-2012, 07:09 PM   #4
sreno0207
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Ha I have a 2011 with 30k on it. I still only get 16ish, look at the thing it has the aero dynamics of a small house!
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Unread 03-17-2012, 07:15 PM   #5
Millermagic
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Depends on the driving. If it's just city, it isn't going to get good mileage at all.
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Unread 03-17-2012, 08:24 PM   #6
Nafpu
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Same issue here, 14.4 after combined city/hwy within first 200 miles, 13.36 on first fill with mainly city driving, now up to 14.08 in town. Slowly improving...
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Unread 03-17-2012, 08:43 PM   #7
bigjeep39
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Yea, its not very aero dynamic. I just dont understand how a nissan titan with a big @$$ motor could get better gas mileage. Jeep has always failed at providing their jeeps with good gas mileage motors. Heck my 4.0L tacoma gets 18-19 in town.

Still love the jeep.
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Unread 03-18-2012, 01:23 AM   #8
GermanyBert
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As others have said if most of your driving is in town you may never see 18 MPG. Sitting at red lights kills fuel economy.
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Unread 03-18-2012, 02:28 AM   #9
Bmxer524
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It's driving habits, your mileage, and what kind of driving you're doing. At about 5k miles I was getting 17.6 with cruise set on 80mph, 2 adult males(my dad and I) and hunting gear for both. I also sat in bumper to bumper traffic for 2-3 hours and that was going from Long Island, NY upstate into the Catskills. Yes the tranny kicked down a few times too. But here on the island I get a little worse(now I have 10k miles) because of traffic and its like 95% highway....I hate when people play with the gas.

Around town, don't expect anywhere near 18. I'm lucky to get 13, I usually average 11.5-12ish. But I have a heavy foot...

Btw this is with a 2011, oh and the hunting trip was in November(KK was stock), and since Christmas I added a brush guard so my KK gained a little weight.

Short version, give it time, and think about how you drive(heavy foot or grandma status?), what kind of driving(pure highway, mostly highway, sit in traffic alot, stop and go city?) and the mileage on the truck. Give it some time to break in, then worry a little about gas mileage....oh yeah, don't forget, IT'S A JEEP, it will never get good mileage lol.
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Unread 03-18-2012, 03:38 AM   #10
GermanyBert
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That is exactly correct. If you do a lot of city driving and then when on the highway you drive 80 MPH you will never get 18 MPG in the Liberty.

The best fuel economy comes on the highway between 2000 - 2500 RPM which means driving between 55 and 65 MPH. And accelerating slowly to get there.

I did a fuel economy test with my Nitro on the Autobahn a few years back. First I drove about 30 miles flat out at 115 MPH (Nitro is governed at 115) and I got 13 MPG. Next I reset the trip computer and set the cruise control at 2000 RPM which was 55 MPG. Result.....26 MPG!!! I am pretty sure the same results are possible in the Liberty.

I drive 20 miles to work everyday and most of it is on the Autobahn. I drive 55 MPH. Co-workers fly by me. I guess I fit in the grandma status but I am ok with that. The oil companies already get enough of my money.

But when short distances are involved, driving flat out or driving sensibly, you still arrive only about a minute or two behind. You saved gas and you are more relaxed when you get there.

When I have to drive longer distances like 100 miles I do kick it up to about 70 MPH.

Sensible driving = higher fuel economy.

I keep meticulous records and for the 5 years I have had my Nitro I have averaged 18.4 MPG.
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Unread 03-18-2012, 05:21 AM   #11
Bmxer524
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Supposedly the "perfect" speed on the Liberty is 63mph. And GermanyBert is right. We get our best mpg around 2k rpm. In the KK that's about 65-70mph. I guess the Nitro's 5speed is just a bit different. I know at 75mph I'm running about 2200-2300rpm(I set my cruise at 75mph daily for a commute to school, 70miles round trip really hurts the wallet in a Jeep). 2500rpm is up around 85ish mph.
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Unread 03-18-2012, 05:46 AM   #12
GermanyBert
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That's great. Hopefully I can drive a bit faster now. Wife's Mustang cruises nicely at 80 MPH under 2000 RPM.
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Unread 03-18-2012, 10:13 AM   #13
bigjeep39
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Yea, lots to consider. Happy with the jeep so that will out weigh the bad gas mileage.

Thanks for the input.
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Unread 03-18-2012, 04:37 PM   #14
2011KK70AE
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Ours was the same way at first; around 13-14 mpg. However now (with 6500 on the odometer) on a recent 450 mile road trip cruising at around 75-80 mph with some hills involved we averaged 20-21 mpg.
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Unread 03-19-2012, 07:35 AM   #15
contsole
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Others have written that the perfect speed is 72 or 73 mph. I had a couple hundred miles to kill on flat level nearly deserted highway and played around with cruise and my trip computer. My mileage absolutely peaked at 72 mph.
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