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Unread 10-29-2013, 11:26 AM   #1
wjgiants39
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2014 jk mpg after new wheels

Just got myself a new 2014 jk 2 door with a manual and loving it! First mod for me was new wheels and tires went up from the stock steel wheels to 265/70 r17 (32") and am loving the new stance and ride it gives it a much better look and keeping it within the stock parameters is fine for what I do offroad. Now I'm not overly worried with mpg cause my drives are usually short ranging from 4-6 miles to location but reading the avg mpg number on the evic it tells me I getting 15.5 around town with the new wheels and tires and this is driving fairly slow and keeping the gear shifts and acceleration as close to the "Eco" mode with the stock steel wheels I was getting 18.5 around town. Anyone have any input on this? I know a bigger tire size would change mpg but not by that much is it related to the engine still breaking in??

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Unread 10-29-2013, 11:42 AM   #2
COLOUXJ
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dont go by what the computer says. What are you hand calcs? Ive had the computer tell me I was getting 15 but got 18, then computer says 18 but got 15.
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is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 10-29-2013, 11:50 AM   #3
ncb
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Have you calibrated the computer for the new tire size?
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Unread 10-29-2013, 12:23 PM   #4
SLADE
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Unless you have recalculated your Jeep, you are traveling farther and going faster than what your Jeep thinks and is telling you.
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Unread 10-29-2013, 12:28 PM   #5
wjgiants39
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I have yet to get it recalculated, would I be able Togo to jeep to get this done? I will have to do some hand calculations later on
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Unread 10-29-2013, 12:29 PM   #6
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You can do a search for a tire size calculator.
The tire calculator will show speedometer error as a result of changing tire sizes.
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Unread 10-29-2013, 12:29 PM   #7
brianjw
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Get an aev procal.

You could pay the dealer to do it. But it's going to be a one time guess and probably not right anyway. A procal has other useful tools built in.

Make sure you get a current version that will work on a 2014.
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Unread 10-29-2013, 12:59 PM   #8
222Doc
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with calibration the jeep should get no less mpg than it was getting, with 32"s even with 3:21. though off road 3:21 and 32"s use Low range more, to much strain on the clutch.

if its 3:73 your golden.

it will improve a bit, it wont be a Prius.

I get from 16.5 to 18 in town with 35"s and a lot of added weight. But with 4:10 gears. On the highway it is not much better 18-19. at steady 50-55 I can get 22 no head wind.
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Unread 10-29-2013, 01:07 PM   #9
SLADE
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I see 15mpg - 18mpg with 35's and 4.88's after using an AEV Procal to recalibrate.
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Unread 10-29-2013, 01:36 PM   #10
wjgiants39
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wow the procal seems to be pretty useful, anyone use it for reading codes? if so how good is it? just buying this jeep and spending $1800 on wheels and tires im trying to hold off on spending any more cash right away haha being that most of my travels are very short would it be ok to hold this off for a month or so? doing my hand calculations Im getting 370 miles per fill up and I filled up my tank both times when it had roughly a 1/8th of a tank left giving me close to 22 mpg which i find very impressive! its all rough estimation being that I do not know the true amount left in the tank and I think living in a somewhat hilly area where I have the ability to coast down long stretches of road help this number a lot but ill take it none the less!
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Unread 10-29-2013, 01:45 PM   #11
MountainMan864
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Damn what kind of wheels and tires did you get that boosted the price to $1800?
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Unread 10-29-2013, 01:54 PM   #12
wjgiants39
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I bought a new spare as well, would of saved me close to 400 bucks but I wanted to have a full matching one, I got Mickey Thompson classic III's with general grabber AT2s its a nice aggressive look for a stock suspension jeep Ive gotten a lot of compliments on it around town! the anvil color really stands out and looks much better with the black rims
ryans-new-jeep.jpg  
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Unread 10-29-2013, 05:44 PM   #13
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Quote:
Originally Posted by wjgiants39 View Post
wow the procal seems to be pretty useful, anyone use it for reading codes? if so how good is it? just buying this jeep and spending $1800 on wheels and tires im trying to hold off on spending any more cash right away haha being that most of my travels are very short would it be ok to hold this off for a month or so? doing my hand calculations Im getting 370 miles per fill up and I filled up my tank both times when it had roughly a 1/8th of a tank left giving me close to 22 mpg which i find very impressive! its all rough estimation being that I do not know the true amount left in the tank and I think living in a somewhat hilly area where I have the ability to coast down long stretches of road help this number a lot but ill take it none the less!
Divide the miles driven from last tank fill by the amount of gallons u just put in it.....u dont have to estimate or have a rough idea. Itll be exact that way

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Unread 10-29-2013, 05:51 PM   #14
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Originally Posted by zjilla View Post
Divide the miles driven from last tank fill by the amount of gallons u just put in it.....u dont have to estimate or have a rough idea. Itll be exact that way
That will not give you an "exact" answer.


The speedometer, odometer, and trip meter will all be wrong unless the Jeep has been recalibrated for the tire size.
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Unread 10-30-2013, 07:29 AM   #15
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Quote:
Originally Posted by SLADE View Post
That will not give you an "exact" answer.


The speedometer, odometer, and trip meter will all be wrong unless the Jeep has been recalibrated for the tire size.
What he said. I you went from the stock 16" wheels with 29" tires to 32" with 17s your almost 10% off right now.
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