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Unread 12-24-2012, 08:21 AM   #16
222Doc
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if you look at the window sticker and READ it. under those epa numbers(highest mpg) in FINE print just under each of those numbers you will read that in town is 14-17 and 17-25.

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Unread 12-24-2012, 08:37 AM   #17
bill9274
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the auto is geared really low wich is cool. you just need taller tires. im in the same boat i have a sport auto with 3.73's and the little tires 2700 rpms at 70. ill be getting 33's soon.

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Unread 12-24-2012, 08:43 AM   #18
brianjw
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My stock 12 jkru manual with 4.10s made 19mpg at 60-65 no problem in the summer with no water on the roads. After 35s and 3.5" lift it would do 17-18 highway in the summer.
I made one 1000 mile trip early winter, lots of wind, standing water on the road and winter gas, driving 80mph and got 14mpg the whole trip. Not bad if you ask me, for what it is. There are tons of variances and using the trip average mpg isn't accurate anyway. You need to hand calculate over a few tanks to get accurate mileage.
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Unread 12-24-2012, 09:04 AM   #19
paul84043
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How many miles on it? Have you done an initial oil change yet?
Our 2012 4 dr 6 spd sport has never dialed in anything under 17mpg and averages 18.7 hand calculated mixed driving.
My guess is that you probably got nailed by a few different variables, was it windy? lots of hills? Winter blend gas?
I dont know..the pentastar with 4.10's should do really well...
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Unread 12-24-2012, 09:07 AM   #20
spyder6
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Quote:
Originally Posted by zrultima
Dont drive 70 go 60 mph the 4:10 is what kills you i have a dually which gets 24 mpg hwy but i drive 50-55mph hills do kill the mileage and heavy tires. My dually has 3.54 gears just for reference plus a diesel so a bit higher mpg than a jeep
Lol no. It's a 24 valve petrol engine with VVT. The difference between 3.73 and 4.11 would be nearly undetectable

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Unread 12-24-2012, 09:07 AM   #21
jstrubberg
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Seems low. If you are checking the dash gauge, forget it. It's notoriously inaccurate, and it's really bad right at first. Mine is now reliable to within about 6/10ths of an mpg, but that's after 45,000 miles of me driving. It started off well over 1mpg off.
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Unread 12-24-2012, 10:21 AM   #22
shedendblue
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Seems that no matter what I do in my 12 Sport (3.73) I get between 16 and 17 mpg. It does go down a bit when I'm trying not to be a rolling road block to the Audis, Mercs, and BMWs on the autobahn - the Jeep just isn't made for 85-95 mph...
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Unread 12-24-2012, 10:36 AM   #23
paul84043
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Quote:
Originally Posted by shedendblue View Post
Seems that no matter what I do in my 12 Sport (3.73) I get between 16 and 17 mpg. It does go down a bit when I'm trying not to be a rolling road block to the Audis, Mercs, and BMWs on the autobahn - the Jeep just isn't made for 85-95 mph...
Umm....no. I'm sure youre mileage would drop horribly at those speeds..
I average about 72 on the freeway and can dial in about 21 on a tank.
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Unread 12-25-2012, 12:01 AM   #24
Cosmobull
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Follow up to all the questions...

I did have the initial oil change done at 700 miles and switched to synthetic. I now have just under 3000 on the clock.
I have a manual and had it on cruise the whole way except for speed traps. It wasn't windy or hilly.
I did a manual calc of my mileage and ended up with about 14.7 which included some in town driving.
I don't drive like I stole it and I wasn't using defrost or AC.
Lastly I did read the fine print and it didn't say I was going to get less than city mileage on the highway. Once again I'm not crying here, it's a jeep which I've had three others. I'm just a bit disappointed in the printed and hyped mpgs.
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Unread 12-25-2012, 12:03 AM   #25
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And by the way, thanks for all the responses. Part of the fun of owning one of these hogs is the other people that own them too...
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Unread 12-25-2012, 06:07 AM   #26
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That last 5 to 10 mph will cost you fuel economy, but not because of higher rpm's. It's mostly because of increasing wind resistance.

Keep at it 60 or 65 mph at the most and you will get a few mpg better.

Should have never sold the wife on buying the Jeep for fuel economy......You would have better off selling her on improved safety, more room, etc. Many women will react in a very positive way when improved safety is mentioned. It's kind of like the way many men react in a very positive way when more power is mentioned when describing a vehicle.
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Unread 12-25-2012, 10:08 AM   #27
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How do you think a stock 2013 JKUR manual trans 4.10 will do with 33" Pizza Cutter BFG LT255 80 17 "E" range will do with MPG?

They are heavier due to size and construction, but only 1" taller than OEM tires. I know that it will throw the speedo/odo off, but I am hoping not to lose much over stock.

Why e range? C to d is roughly 6 lbs heavier per tire. The increased height and minor width increase along with the heavier load should net you about 10lbs heavier per tire. I doubt you will see much more than a half mpg loss on the setup. I only lost 3mpg going to 37x12.50x17Ds on 4.11s
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Unread 12-25-2012, 11:23 AM   #28
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On the highway, I can average around 19 mpg at 65 mph. Around town, stop 'n go, it will get 14-15. I have a 2007 Sahara unlimited with 4.10 gearing. Stock tires and suspension.
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Unread 12-26-2012, 02:14 AM   #29
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Quote:
Originally Posted by doc5339
How do you think a stock 2013 JKUR manual trans 4.10 will do with 33" Pizza Cutter BFG LT255 80 17 "E" range will do with MPG?

They are heavier due to size and construction, but only 1" taller than OEM tires. I know that it will throw the speedo/odo off, but I am hoping not to lose much over stock.

Why e range? C to d is roughly 6 lbs heavier per tire. The increased height and minor width increase along with the heavier load should net you about 10lbs heavier per tire. I doubt you will see much more than a half mpg loss on the setup. I only lost 3mpg going to 37x12.50x17Ds on 4.11s
They are "E" Range because that is the only range the LT255 80 17 BFG KM2 comes in. Why the KM2, because that is the only 33" tire that will fit on a 2013 JKUR OEM rim with no mods whatsoever.

I realize that they are heavier, and that the increased unsprung weight will make for a rougher ride and lower MPG.

Just wondering how much lower the MPG will be? 255 80 17 is a true 33" diameter, but it is the same width as stock tires.
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Unread 12-26-2012, 07:24 PM   #30
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Quote:
Originally Posted by Cosmobull View Post
Follow up to all the questions...

I did have the initial oil change done at 700 miles and switched to synthetic. I now have just under 3000 on the clock.
I have a manual and had it on cruise the whole way except for speed traps. It wasn't windy or hilly.
I did a manual calc of my mileage and ended up with about 14.7 which included some in town driving.
I don't drive like I stole it and I wasn't using defrost or AC.
Lastly I did read the fine print and it didn't say I was going to get less than city mileage on the highway. Once again I'm not crying here, it's a jeep which I've had three others. I'm just a bit disappointed in the printed and hyped mpgs.
you didn't say how fast you were going. aerodynamic resistance doesn't scale linearly. If you go 10% faster, the wind resistance increases much more then 10% (as does your fuel usage)
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