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4" lift and MPG report

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Old 08-03-2010, 04:55 AM
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Originally Posted by grady
Are you calculating these out, or are you using the Jeep computer to tell you your average mpg? I know on my 2010 JK that the mileage computer is way off. It reports about 1.5 mpg higher than I actually get on a tank full if I manually calculate it.
Yea, I figured out pretty quick that the computer was wildly optimistic. I just jot down the odometer reading on the receipt and I keep all the receipts in one envelope.
Old 08-03-2010, 06:30 AM
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Rookie question but will changing out the gearing improve mileage? I have the 3.10 running 33's.
Old 08-03-2010, 07:46 AM
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Originally Posted by funwthmud
I have 3.73's and 305x70x16 TA's at the moment. I seem to consistently get 14.5 mpg in town and about 16 on the freeway( if there is no wind). It seems to me that the main reason for the variance in mpg in stock jeeps is the driving style/speed. I personally drive FAST and rarely do under 75 on the freeway. in town I dont speed but Ill do jackrabbit starts.

I wonder how the OP and others drive that are getting 17+ in town and 19+ freeway
I get about the same mpg. The last few weeks I've been driving with Overdrive off at all times, instead of just on hills, and I've actually improved by gaining 1 additional mpg on average. I find the rpm's fluctuate less and hold more constant....usually between 2000-3000 rpm.
Old 08-03-2010, 07:48 AM
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Originally Posted by grady
Are you calculating these out, or are you using the Jeep computer to tell you your average mpg? I know on my 2010 JK that the mileage computer is way off. It reports about 1.5 mpg higher than I actually get on a tank full if I manually calculate it.
I've found that the more accurately I've dialed in my Superchip tune with proper gearing, tire height, etc., my computer avg mpg reading is much more accurate.
Old 08-03-2010, 10:22 AM
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i have 18k miles on my unlimited rubi. best i have seen was 16mpg going west on I 10 across florida . Stock rubi kms with a 2.5 coil lift <tera>. Overall adv fuel has been 14.5 mpg for the 18k . Hwy driving is always gps set at 8 over the speed limit on cruise. thats running the SC flash pac on 87 oct , a k&n drop in filter and my own mandrel be 2.5 straight exhaust.

this kind of mileage makes me say at 36k its time for a diy hemi cause it will get as good if not better mileage and after the bumper to bumper war is gone what do i need a mini van motor for ?

btw its a 6sp
Old 08-03-2010, 11:22 AM
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Why would a 4" lift have any effect on the mileage? The rolling resistance and aerodynamics are the same, no?
Old 08-03-2010, 12:00 PM
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Originally Posted by Super1
Why would a 4" lift have any effect on the mileage? The rolling resistance and aerodynamics are the same, no?
Usually, by the time you put a lift of any size, the stock geometry has changed. In most cases, this also affects the small front rake you see on stock vehicles. Although not significantly, I'm sure this can affect fuel mileage some. When I went from stock to a 4" RC lift, I noticed a little more wind noise on the header, but no real change in fuel economy.
Old 08-03-2010, 12:23 PM
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Originally Posted by Super1
...and aerodynamics are the same, no?
No. There's no question that a lifted vehicle is catching more air. The unsprung stuff stayed down there and everything else moved up 4".
Old 08-03-2010, 12:28 PM
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Don't forget the Tire size rolling resistance and weight! That is a big player in mileage.
Old 08-03-2010, 01:26 PM
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2010 Wrangler Sport with 33x12.5 tires, Superchips Flashpaq, K & N Cold Air Kit and MBPR performance exhausts. Averaging between 16.8 and 17.3 MPG City driving. Without the Superchips, Cold Air Kit and exhausts was getting around 15.3 MPG. BTW no lift yet.


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