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Old 12-06-2011, 04:48 PM   #1
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Thumbs down brand new 2012 JKUR. getting terrible gas millage. need some suggestions

So I've been getting around 10-11 mpg. My driving is 100% city driving on long island. I've been trying to be as easy as I can be. But obviously that does not help. I have about 700 miles on the jeep so far. One odd thing I noticed earlier. I reset the computer about a block before stopping at a red light. When I stopped It read about 5mpg and as I was at a dead stop it continued to drop to about 3mpg. As I drove home the highest I was able to get was 16.5 but that was only during a mile or 2 straight away. Yet I continued to notice that everytime I was stopped at a red light no matter what number it was on, it started to decrease in mpg. If im sitting at a stop. Why is it dropping in mpg? This is my 3rd fill up. I have about 180miles on this fill up and its telling me I have about 30 miles left. There has to be something wrong. And yes I am trying to drive as easy as possible.

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Old 12-06-2011, 04:53 PM   #2
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Break in?

Are you calculating by hand?

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Old 12-06-2011, 04:54 PM   #3
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It should drop when you are standing still. Think about it... If you are not moving, but idle long enough, you will eventually burn a gallon of gas while going exactly zero miles.

Nothing is wrong...
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Old 12-06-2011, 04:55 PM   #4
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Originally Posted by Pomz623 View Post
So I've been getting around 10-11 mpg. My driving is 100% city driving on long island. I've been trying to be as easy as I can be. But obviously that does not help. I have about 700 miles on the jeep so far. One odd thing I noticed earlier. I reset the computer about a block before stopping at a red light. When I stopped It read about 5mpg and as I was at a dead stop it continued to drop to about 3mpg. As I drove home the highest I was able to get was 16.5 but that was only during a mile or 2 straight away. Yet I continued to notice that everytime I was stopped at a red light no matter what number it was on, it started to decrease in mpg. If im sitting at a stop. Why is it dropping in mpg? This is my 3rd fill up. I have about 180miles on this fill up and its telling me I have about 30 miles left. There has to be something wrong. And yes I am trying to drive as easy as possible.
When you are sitting at a stop - the engine is running and using gas, but you are not going anywhere. That would mean, you are getting 0mpg at that time. If you just reset it, then the mpg is going to drop fast. Try to let it break in and make sure that your tires are properly inflated.
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Old 12-06-2011, 05:02 PM   #5
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Originally Posted by Red Sahara

When you are sitting at a stop - the engine is running and using gas, but you are not going anywhere. That would mean, you are getting 0mpg at that time. If you just reset it, then the mpg is going to drop fast. Try to let it break in and make sure that your tires are properly inflated.
And don't rely on the dash reading.

Resetting it often doesn't help either.
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Old 12-06-2011, 09:04 PM   #6
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Break in?

Are you calculating by hand?
so i just filled up. and i calced by hand and i still got 10.1mpg. i really dont think it should be that low. and i checked my tires and its good.
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Old 12-06-2011, 09:23 PM   #7
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Originally Posted by Pomz623

so i just filled up. and i calced by hand and i still got 10.1mpg. i really dont think it should be that low. and i checked my tires and its good.
Ok... There is a 2012 mpg thread going.
Some were not getting the numbers that they thought they should be getting. That is low but I do think the numbers will creep up after some mileage is put on and the ECU adjust.
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Old 12-06-2011, 09:27 PM   #8
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take the e-brake off...lol
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Old 12-06-2011, 09:29 PM   #9
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Ive been getting around 20.8 MPG (Comp, not hand) while doing about 70% highway and 30% city. I'm not going to hand calc the milage until I have a few thousand miles on her. So I cant complain.
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Old 12-06-2011, 09:31 PM   #10
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Jesus can do a lot, but only perform so many miracles! And gas mileage is probably not real high on his list. God look at the world today, he is a busy man and probably tired after making all of the 3.6 lordstars.
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Old 12-06-2011, 09:51 PM   #11
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check your milage by: Filling tank , Drive 300 miles, fill tank again, divide 300 by number of gallons put in in second fill up.....that is your true MPG. Consider from there ..... % of Highway to City....2 lane Passing to Granny driving . Also do a mile check on the highway : Does your odometer record 1 mile equal to an actual mile on highway (use mile marker posts) , Larger tires could shorten the Mile on odometer meaning MPG could be off by 5-10%
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Old 12-06-2011, 09:56 PM   #12
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Originally Posted by KSCRUDE
Jesus can do a lot, but only perform so many miracles! And gas mileage is probably not real high on his list. God look at the world today, he is a busy man and probably tired after making all of the 3.6 lordstars.
I lol'd
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Old 12-06-2011, 10:46 PM   #13
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check your milage by: Filling tank , Drive 300 miles, fill tank again, divide 300 by number of gallons put in in second fill up.....that is your true MPG. Consider from there ..... % of Highway to City....2 lane Passing to Granny driving . Also do a mile check on the highway : Does your odometer record 1 mile equal to an actual mile on highway (use mile marker posts) , Larger tires could shorten the Mile on odometer meaning MPG could be off by 5-10%
what if i cant even get to 300 miles on one tank? i got a little over 200 on my last fill up

and jeep is stock so i would assume odo is good
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Old 12-06-2011, 10:48 PM   #14
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Ima just keep driving like normal for now. if there inst anything i can do or even check, then I guess im just shit outa luck.
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Old 12-06-2011, 10:53 PM   #15
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Welcome to Jeepdome. It is winter and vehicles generally get worse mileage because of winterblend gas. (Of course there will be some contrary comments on this, but it is generally the case) Fuel costs were one of the factors that I seriously considered before purchasing my Jeep. Even though it averages about 16 combined for me, the cost to run it compared to my old car that averaged 20 is only about $50 more per month. The utility and enjoyment of the JK is worth that to me so it is one of the tradeoffs.
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Old 12-06-2011, 10:53 PM   #16
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I would keep taking it to the dealer IMHO. If the milage is that far off from what the sticker says then they have to do something, if not give you a new Jeep exactly like the one you just bought. I know I would be bitching myself if I was getting 1/2 of what the advertised MPG was. Seriously, press the issue......
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Old 12-06-2011, 11:04 PM   #17
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Don't even think about MPG until 2500-3000 miles break-in period is over. The computer may be programmed to run rich on fuel till break-in is over. Then switch to a K&N air filter, full synthetic oil in everything and recalc your MPG. Don't even think about it now.
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Old 12-06-2011, 11:16 PM   #18
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Don't even think about MPG until 2500-3000 miles break-in period is over. The computer may be programmed to run rich on fuel till break-in is over. Then switch to a K&N air filter, full synthetic oil in everything and recalc your MPG. Don't even think about it now.
According to several discussion on this forum alone the K&N air filter seems to be a waste of money and allows more dirt enter the intake.
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Old 12-07-2011, 06:43 AM   #19
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I'm ecstatic with my mpg. My other car is a srt10 quadcab. I average 9 highway and city. I'm double that in the jeep.
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Old 12-07-2011, 07:15 AM   #20
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Don't even think about MPG until 2500-3000 miles break-in period is over. The computer may be programmed to run rich on fuel till break-in is over. Then switch to a K&N air filter, full synthetic oil in everything and recalc your MPG. Don't even think about it now.
It's not programmed for a break in. I also disagree with an oiled filter. Full synthetic can't hurt. A lot of stop and go driving will kill your mpg, but you should get at least 15-16 doing the math. It wouldn't hurt to take it to the dealer and let them plug it in. Maybe there is an issue.
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Old 12-07-2011, 07:20 AM   #21
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I would keep taking it to the dealer IMHO. If the milage is that far off from what the sticker says then they have to do something, if not give you a new Jeep exactly like the one you just bought. I know I would be bitching myself if I was getting 1/2 of what the advertised MPG was. Seriously, press the issue......
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Old 12-07-2011, 09:16 AM   #22
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The testing to determine the city MPG that is on the sticker is probably not stoplight to stoplight driving.

What's killing your mileage is all the accelerating to get up to speed. At constant speed, even slower city speeds, you're mileage is probably much closer to the sticker, if not better.

To increase your MPG try using your brakes as little as possible. Anticipate lights, coast as much as possible.
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Old 12-07-2011, 09:32 AM   #23
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My mileage has consistently been 13-14 MPG city. I took it for an extended highway ride for the first time last week, it shot right up to between 22 and 22.5. City driving is killing us, period.
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Old 12-07-2011, 10:04 AM   #24
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Doesn't matter. If the sticker says 17 city then it needs to deliver 17 city or you have a case. 10 city is unacceptable and there is some kind of ECU problem that needs to be addressed.
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Old 12-07-2011, 10:10 AM   #25
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Doesn't matter. If the sticker says 17 city then it needs to deliver 17 city or you have a case. 10 city is unacceptable and there is some kind of ECU problem that needs to be addressed.
Unless of course you read the actual words. Those words clearly state the following: Your actual mileage will vary depending on how you drive and maintain your vehicle.

Don't believe me? Go look at your sticker.
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Old 12-07-2011, 10:20 AM   #26
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Doesn't matter. If the sticker says 17 city then it needs to deliver 17 city or you have a case. 10 city is unacceptable and there is some kind of ECU problem that needs to be addressed.

Not true..its only an estimate not a guarantee. Daggo is correct it may vary due to the many variables.
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Old 12-07-2011, 11:10 AM   #27
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Not true..its only an estimate not a guarantee. Daggo is correct it may vary due to the many variables.
But here are laws limiting the amount of variation. If your getting 50% of what is advertised, then something is wrong with the vehicle and something has/needs to be done. If, for say, he was getting 17mpg highway and the advertised mpg was 21, then he wouldn't have a case. But 50%? Come on, If you where to buy a Corvette and its supposed to be a 0-60 4.5 sec car but its only does 0-60 in 8 sec, wouldn't you be concerned? Even though the the 0-60 is dependent on driver, the 9 sec time does show something is wrong. I wouldn't be sitting by with the old mentality "oh well, its a Jeep" screw that. I've only had 1 Jeep get that kind of milage and that was my 01 TJ, but it had 37's on it, 8" RR SkyJacker with 2" body, Borla Header and catback, Hi-flo Cat, Chip, KAI, Hanson bumpers (front, rear, and sliders) and others.
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Old 12-07-2011, 11:29 AM   #28
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That's how mine was, after the break in I now get like 19 mpg average. I noticed it got a lot better when I was keeping my RPM in the green area on the dash, also after my first oil change it got even better, goodluck
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Old 12-07-2011, 11:32 AM   #29
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Ima just keep driving like normal for now. if there inst anything i can do or even check, then I guess im just shit outa luck.
Try to take it out on some back country roads where you can maintain 50-60 mph and see how it looks at that point. Especially after the engine is broken in.

I'm just guessing...but a tight engine inside of a +4300 pound beast on M/T tires in the stop and go traffic of Long Island is going to get bad gas mileage.....especially with winter blend fuel.
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Old 12-07-2011, 11:51 AM   #30
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B&C is correct. It's the average variation that determines the case. 50% is wayyy outside the window. You could literally floor it from light to light and still do better than 10mpg in these vehicles in city traffic, assuming you aren't stuck in traffic idling for 20 minutes at a time for every 5 minutes of drive time.

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