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Old 12-14-2009, 06:55 PM   #1
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Fuel mpg

Im slightly confused...I bough my jeep expecting to get maby 16mpg.... I have a 99 jeep wrangler sport 6 cyl 5 spd and I am getting 19-20 mpg. Is that normal? Im definitly not complaining!

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Old 12-14-2009, 06:58 PM   #2
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Probably a little above normal. I would be counting my blessings for sure at 19. I usually get around 14 in combined driving.

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Old 12-14-2009, 07:02 PM   #3
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totally possible,my 97 tj got 19 MPG highway with 31" tires and a 2.5 OME lift.Now Im down to 15 MPG with 33x12.5 mtr,s RE 4.5 lift/ 1.250 BL.
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Old 12-14-2009, 07:12 PM   #4
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I get 19 pretty consistently in my 00, 28" tires, though.
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Old 12-14-2009, 07:23 PM   #5
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I have 31" tires with 2" coil spacers. I do alot of highway cruising about 80mph, if I stay below 65 I get a tad over 20mpg... but thats rare I do that lol Ill be happy with my 19mpg... Oh yea, If I towe... I get 13.... aa drive to breezewood, PA with three dirtbikes was quite a few fill ups
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Old 12-14-2009, 07:35 PM   #6
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I usually get in the 18 - 22 mpg with 31" tires, that's running 85 & 91 octane straight gas. It's bitter cold here now (-26 up to + 10), so checking mileage is a waste of time. Extended warm-up's, in and out of 4wd, plus using 5% ethanol fuel to avoid freeze-up, and ethanol sucks for mileage purposes!
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Old 12-14-2009, 07:37 PM   #7
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I have 31" tires with 2" coil spacers. I do alot of highway cruising about 80mph, if I stay below 65 I get a tad over 20mpg... but thats rare I do that lol Ill be happy with my 19mpg... Oh yea, If I towe... I get 13.... aa drive to breezewood, PA with three dirtbikes was quite a few fill ups
Your lucky man and you drive 80 in a jeep? I never go over 70 because my rpm's are already at 2500 and really don't want to go any higher.
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Old 12-14-2009, 08:01 PM   #8
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Your lucky man and you drive 80 in a jeep? I never go over 70 because my rpm's are already at 2500 and really don't want to go any higher.
Yea, mine get right around there...Ive red lined it gettin on the highway...hits 100 pretty quick... I ought video it
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Old 12-14-2009, 08:04 PM   #9
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I usually get in the 18 - 22 mpg with 31" tires, that's running 85 & 91 octane straight gas. It's bitter cold here now (-26 up to + 10), so checking mileage is a waste of time. Extended warm-up's, in and out of 4wd, plus using 5% ethanol fuel to avoid freeze-up, and ethanol sucks for mileage purposes!
Way too cold for me! wouldn't mind the snow though
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Old 12-14-2009, 08:06 PM   #10
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Yeah I don't think I have ever red lined mine before. It's not really a speed demon, but they are decent enough.
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Old 12-14-2009, 08:18 PM   #11
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Yeah I don't think I have ever red lined mine before. It's not really a speed demon, but they are decent enough.
yea, some moron was blocking the entrance to the highway and a nice size tractor trailer was comming.... wasn't about to get smashed nothing I do regurly... would like to keep the motor going
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Old 12-14-2009, 09:53 PM   #12
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yea its normal if you have tires 31" or less. thats what the EPA estimated is. 16 is for 33" or so
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Old 12-14-2009, 10:20 PM   #13
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Originally Posted by KawiTJ View Post
Im slightly confused...I bough my jeep expecting to get maby 16mpg.... I have a 99 jeep wrangler sport 6 cyl 5 spd and I am getting 19-20 mpg. Is that normal? Im definitly not complaining!
There are some questions that haven't been asked.

What size tires are you running?

Are the gears stock?

Have you ensured your speedo/odometer is correct?

I won't say it's impossible to get 20mpg in a TJ but to do it consistently is just beyond "normal".

The fuel gauge is notoriously inaccurate in our TJ's as well.

I recommend checking it with GPS and a fill up vs miles ran comparison.
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Old 12-15-2009, 08:01 AM   #14
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stock tj's will see 19, any mods above 33's you will see 15 + or -
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Old 12-15-2009, 07:08 PM   #15
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[QUOTE=stevens243;505408]There are some questions that haven't been asked.

I have stock gears, 31" tires and my spedo for some reason is about 7mph faster then what I am actually going. I check my miles with my odometer and how much gas goes in the tank.... and a consistantly come out with 19 and sometimes 20
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Old 12-15-2009, 07:17 PM   #16
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Stocker with 30/9.50/15 tires and I can't get anything over 16mpg street or highway
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Old 12-15-2009, 07:29 PM   #17
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Stocker with 30/9.50/15 tires and I can't get anything over 16mpg street or highway
I used to think my 16 was good until I started reading how good these other Jeeps are doing...
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Old 12-15-2009, 08:06 PM   #18
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[QUOTE=KawiTJ;506053]
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Originally Posted by stevens243 View Post
There are some questions that haven't been asked.

I have stock gears, 31" tires and my spedo for some reason is about 7mph faster then what I am actually going. I check my miles with my odometer and how much gas goes in the tank.... and a consistantly come out with 19 and sometimes 20
Sounds like you have larger than stock tires (I believe you had 28.5" tires stock but I may be wrong).

Either way, that 7mph is the same amount of extra mileage you are getting on the odometer that is throwing off your calculation.

Long term, best to get your speedo/odo corrected but you can also use a GPS to determine your actual distance on a tank (or certain amount of fuel). I'll bet you are getting around 15 mpg or so.

I get 14 (normally) with my mix of city/hwy driving on 35's with a 6" lift, armor etc. When I make long distance runs and keep the speed locked in at 55 I CAN get up to 20-21. NOT normal, but I've gotten it before.
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Old 12-15-2009, 09:21 PM   #19
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With larger tires, you should be getting a lower mpg rating and your speedo should be SLOWER than your actual speed...

I had my speedo gear calibrated as one of the conditions before I bought my Jeep...I haven't tested to see if they did it properly, but if they did, then I'm getting a pretty consistent 13-14 mpg mixed driving. I did get 19 once, but mostly I've stayed around 13 so far.
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Old 12-15-2009, 09:33 PM   #20
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I got the 2009 3.8 jk AGM is 16.9 looking for a chip to pick it up any ideas?
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Old 12-15-2009, 09:57 PM   #21
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wtf???
I have 35's 3.73's and 7 inches of lift and the 6cyl engine and i can easily get 19 on the highway and about 15 around town, im not sure why you stock people are getting lower than I am. and yes my speedo is corrected
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Old 12-15-2009, 10:09 PM   #22
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Ok, so now I am really nervous...a week shy into driving my Jeep, 2002 pretty much stock with 31's, the needle is dropping off of full with less than 30 miles from a full tank, had about 85 miles between 3\4 and 1\2. By my rough math this puts me 225 miles to a full tank.

225 \ 19 - just a hair under 12mpg? Being the cheap bastard I am I am always shifting early...
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Old 12-15-2009, 10:24 PM   #23
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Quote:
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Ok, so now I am really nervous...a week shy into driving my Jeep, 2002 pretty much stock with 31's, the needle is dropping off of full with less than 30 miles from a full tank, had about 85 miles between 3\4 and 1\2. By my rough math this puts me 225 miles to a full tank.

225 \ 19 - just a hair under 12mpg? Being the cheap bastard I am I am always shifting early...
The gas gauge is far from accurate... one day I was down to 3/4 tank according to the gauge yet I'd only driven 16 miles. I still averaged around 13.4 mpg that tank. The next tank I had over 60 miles on it before the needle got down to 3/4 tank and once again, 13.4 mpg.

If you know your speedo is accurate, then the only way to get an accurate mpg reading is to fill your tank up and then divide the miles driven on that tank with the number of gallons of gas it took to fill your tank back up. That will also give you an accurate range.

ie. If you get an average of 13.4 mpg then 13.4 x 19 = 254.6 avg miles to a tank of gas.
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Old 12-15-2009, 10:28 PM   #24
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X2 on the needle moving fast. I can squeeze 17-18 on the hwy but my in town has dropped significantly due to the cold weather warm ups, idling and very very short commute. Apparently, the 4.0 does not like idling at all. Might as well be blowing the fuel out the tail pipe, IMO.
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Old 12-16-2009, 12:20 AM   #25
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I get 14-15MPG average with 33's, 4.56 gears, 4.0, and 5-speed. I usually drive 70-75MPH on the freeway. And my speedo is dead on.
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Old 12-16-2009, 07:21 PM   #26
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Just drove my 05 Rubicon today after installing 4&1/2 RE LA, 35 inch tires, 6 speed, 4.0. 4.10 gears. Speedo right on, adjusted it with town radar speed sign, took about 6 times driving by to get it right. Got a tad over 17 mpg in 105 miles of highway and town driving. Got about 15 and 1/2 before with stock tires and no lift. I'll have a better idea driving it to Moab for the Easter Jeep Safari next April. Parked it in garage today and probably won't drive it till then.
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