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Old 03-13-2012, 06:00 AM
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Gas mileage on 37s?

Just like the title says, how do 37 inch tires affect your gas mileage from stock? or compared to 35s even?
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Old 03-13-2012, 06:14 AM   #2
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It obviously affects it negatively and worse than 35's. I would imagine it would be in the very low double digits.

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Old 03-13-2012, 07:13 AM   #3
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i'd probably throw out... if you can afford to run 37's on a DD you probably don't need to worry about the price of gas....

just sayin!

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Old 03-13-2012, 07:17 AM   #4
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I average 15's with 35" tires.
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Old 03-13-2012, 07:18 AM   #5
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ive avg 0 all week now
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Old 03-13-2012, 07:20 AM   #6
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Quote:
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I average 15's with 35" tires.
yeah in the mountains of Tampa Bay i'm averaging low 16's with 35's...

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Old 03-13-2012, 07:26 AM   #7
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Im avg 12-13 here in the high country of Naples Fl & get 10-12 all summer in Colorado on 37" w 5:13 gears
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Old 03-13-2012, 07:58 AM   #8
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Originally Posted by HookmCowboys View Post
Im avg 12-13 here in the high country of Naples Fl & get 10-12 all summer in Colorado on 37" w 5:13 gears
reaching hummer mileage...
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Old 03-13-2012, 10:27 AM   #9
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with 35s and 373s i got 13

with 37s and 373s i got 12-13

with 37s and 513s i get about 11.5

i do all city though. jeep is a two door automatic

performance:

superchips, jetchip, airraid, throttle body, catback exhaust, headers
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Old 03-13-2012, 10:32 AM   #10
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'07 JKU on 37's. Sees trails about every other weekend. 14mpg. If I do a lot of highway driving 16mpg. Upping the wheeling to every weekend, drops to 13mpg.


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Old 03-13-2012, 01:10 PM   #11
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My '12 JKUR/4.10/36's (measure 35.75" @ 27psi) - 13mpg
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Old 03-13-2012, 01:30 PM   #12
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I have to admit though, I really do not care about the mileage in the rig. It's built the way I want it, and it is up to the task.

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Old 01-28-2016, 10:15 AM   #13
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Folks love to fudge a bit on there MPG math and seeing a bit of that here I believe. Devicemanager's 13 MPG numbers on 36's with 4:10 gears rings true with my numbers as well. To get 16 mpg on 37's would require a rig with a manual trans, as low to the ground as possible, and lighter then any Jeep I have ever owned and have owned 9 with well over a million miles total drive time....so far If mileage matters then 37's should NOT be in your future.
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Old 01-28-2016, 10:55 AM   #14
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This is one of those "don't ask" things.
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Old 01-28-2016, 12:24 PM   #15
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Sitting at 13.6 on 37s with 5.13 (light two door auto).
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Old 01-28-2016, 12:28 PM   #16
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13.8 w/ 3.73s...
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Old 01-28-2016, 12:34 PM   #17
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Quote:
Originally Posted by TheNoob View Post
13.8 w/ 3.73s...
Just out of curiosity, how is that setup doing for you running 37's on the 3.73 gearing. 3.6 motor?
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Old 01-28-2016, 12:37 PM   #18
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Never looked before...
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Old 01-28-2016, 12:39 PM   #19
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Originally Posted by rubiman1969 View Post
Just out of curiosity, how is that setup doing for you running 37's on the 3.73 gearing. 3.6 motor?
I was expecting it to be miserable, from what I would read on forums. Its actually manageable, IMO. Still plan on regearing, but not as soon as I first thought.
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Old 01-28-2016, 01:08 PM   #20
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I took the Jeep on a road trip, all highway, from Lakeland area to St. Augustine. I was up to 17.5 at one point on the highway on my 37's. But normally around 14.5 around town.
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Old 01-28-2016, 01:10 PM   #21
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16mpg with 37s 6spd. All around town driving.
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Old 01-28-2016, 01:45 PM   #22
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16mpg with 37s 6spd. All around town driving.
Did you adjust your speedo and tire size with a programmer? How are you calculating your mpg? That seems way too high for city driving. I'm lucky to get that on the highway and I have the same set up as you
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Old 01-28-2016, 01:55 PM   #23
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I was expecting it to be miserable, from what I would read on forums. Its actually manageable, IMO. Still plan on regearing, but not as soon as I first thought.
Odd question but how fast can you drive with that setup and still feel comfortable? is the 13.8 combined or mostly highway?
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Old 01-28-2016, 01:58 PM   #24
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Originally Posted by pluke the 2 View Post
with 35s and 373s i got 13 with 37s and 373s i got 12-13 with 37s and 513s i get about 11.5 i do all city though. jeep is a two door automatic performance: superchips, jetchip, airraid, throttle body, catback exhaust, headers

Hmmm. So on 37's. You regeared from 3.73 to 5.13 and your city driving MPG went down?
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Old 01-28-2016, 01:59 PM   #25
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Originally Posted by devicemanager View Post
My '12 JKUR/4.10/36's (measure 35.75" @ 27psi) - 13mpg
What are your tires?
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Old 01-28-2016, 02:01 PM   #26
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16mpg with 37s 6spd. All around town driving.
Yes superchips, its all computer. Could be off a bit but Im not filling up that much so I dunno.
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Old 01-28-2016, 02:03 PM   #27
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Originally Posted by JBVette View Post
I took the Jeep on a road trip, all highway, from Lakeland area to St. Augustine. I was up to 17.5 at one point on the highway on my 37's. But normally around 14.5 around town.
That's about what my dash display computer tells me on mine, I am on stock 255/75 MT's and 4.10.
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Old 01-28-2016, 02:47 PM   #28
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Odd question but how fast can you drive with that setup and still feel comfortable? is the 13.8 combined or mostly highway?
Pretty much all city driving. I didn't notice much of a difference on the highway from 35s to 37s, it cruises comfortable at ~70, it doesn't feel like the engine is being overworked.
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Old 01-28-2016, 02:50 PM   #29
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that's about what my dash display computer tells me on mine, i am on stock 255/75 mt's and 4.10.
+1
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Old 01-28-2016, 02:57 PM   #30
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I'll let you know....

Quote:
Originally Posted by rubiman1969 View Post
Just out of curiosity, how is that setup doing for you running 37's on the 3.73 gearing. 3.6 motor?
I have this exact setup and will reply back this evening. Have to fill'er up and will calculate the MPG.

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