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Old 04-04-2012, 06:54 PM   #1
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Talking Rear Axle 4:11 vs 3.73

I am in the process of ordering a 2012 Rubicon and was considering the 3.73 axle for better milage. I will be using as a daily driver, mostly city and very little off road. Does anyone have an opinion on this?

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Old 04-04-2012, 06:57 PM   #2
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Well I don't know how 3.73s are, but I bought a '12 with 4.10s and I got 19.5 mpg with 70% highway 30% city/mountain roads with the AC on parts of the time

Pretty close to the 20mpg rated, and a lot of it was 7-10000ft, so i'm not concerned

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Old 04-04-2012, 07:04 PM   #3
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axle ratios and mpg

I would be happy with your mileage, but I am an old guy and if I could squeez out another mpg maybe I will try the 3.73.
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Old 04-04-2012, 07:05 PM   #4
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Sounds like a Sahara may be a better option... Just saying if you aren't going to offroad much...
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Old 04-04-2012, 07:09 PM   #5
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Quote:
Originally Posted by snikt View Post
Well I don't know how 3.73s are, but I bought a '12 with 4.10s and I got 19.5 mpg with 70% highway 30% city/mountain roads with the AC on parts of the time

Pretty close to the 20mpg rated, and a lot of it was 7-10000ft, so i'm not concerned
FWIW,
Modern engines, especially NA engines, tend to get better fuel economy at higher altitude as they cut fuel due to lower air density. Its small though.
Higher altitudes tend to be drier as well, which helps.
Finally, at high altitudes, aero drag is lower - with these bricks, anything can help.
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Old 04-04-2012, 07:13 PM   #6
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Originally Posted by Str8edg View Post
Sounds like a Sahara may be a better option... Just saying if you aren't going to offroad much...
watcha saying?


my 98 sahara can go anywhere....
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Old 04-04-2012, 07:13 PM   #7
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The one caveat to my last post is that people will often "gas" their vehicle more at high altitude to compensate for the lower power output. This will tend to lower fuel economy.
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Old 04-04-2012, 07:14 PM   #8
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FWIW,
Modern engines, especially NA engines, tend to get better fuel economy at higher altitude as they cut fuel due to lower air density. Its small though.
Higher altitudes tend to be drier as well, which helps.
Finally, at high altitudes, aero drag is lower - with these bricks, anything can help.
I always wondered if the fuel evens out going up in the mountains. For example when I'm climbing the steeper areas of I-70 (10+ miles) usually at 3-4k RPM in my Mustang. When you come down though you burn like 0 fuel, but a ton going up
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Old 04-04-2012, 07:22 PM   #9
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IMO, if you plan to increase your tire size later or plan on doing some extreme offroading, where more power would be needed, you may want to go with the 4.11.
I would think pairing 3.73 gears with the pentastar engine, should be way more than sufficient for most offroading plus give you the mileage you want on the highway and around town.
As for gas mileage, it's a Jeep, don't dwell on it. Just pay the man wearing the turban and have fun, one or two extra mpg ain't gonna make or break ya.
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Old 04-04-2012, 08:37 PM   #10
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I always wondered if the fuel evens out going up in the mountains. For example when I'm climbing the steeper areas of I-70 (10+ miles) usually at 3-4k RPM in my Mustang. When you come down though you burn like 0 fuel, but a ton going up
But at least we can put in 85 octane. I'm from NY originally and never heard of it till i moved here.
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Old 04-05-2012, 01:44 PM   #11
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If you dont Plan on doing any off-Roading and your not going to lift or add bigger tires. Why would you want a Rubi?
i think Gas MPG wise a better fit would be a Sahara 3.21 gears
I would only say 3.73 if you were going to Tow.

Like U said your "an old guy and if I could squeez out another mpg"
The Sahara 3.21 would be perfect if you dont plan on towing.

But if you want the Rubi for what ever case, I think for you 3.73 Rubi fits you best.

Me im ordering the JKUR 4.10 because it fits my needs best

JaVa
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Old 04-05-2012, 03:14 PM   #12
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3.23

hi, i ordered my jk sport with limited slip and 3.21 and get 20 to 30
mpg, also 95% of my drive is on the road, also ordered the 17" factory
wheel tire combo, very happy with the Jeep. ps; its a 2 door, if you are
going to go with the 4 door then the 3.73 may be better..have fun..
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Old 04-05-2012, 03:21 PM   #13
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Quote:
Originally Posted by firehawk
hi, i ordered my jk sport with limited slip and 3.21 and get 20 to 30
mpg, also 95% of my drive is on the road, also ordered the 17" factory
wheel tire combo, very happy with the Jeep. ps; its a 2 door, if you are
going to go with the 4 door then the 3.73 may be better..have fun..
I call bullshit on that 20-30 mpg....only way your gonna get close to 30 or even mid 20's is going downhill with the wind pushing you.....
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Old 04-05-2012, 03:34 PM   #14
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I call bullshit on that 20-30 mpg....only way your gonna get close to 30 or even mid 20's is going downhill with the wind pushing you.....
Even driving dead straight through Indiana on the freeway with my Jeep bone stock I didn't get 20mpg.
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Old 04-05-2012, 03:45 PM   #15
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Quote:
Originally Posted by longhorn1966 View Post
I am in the process of ordering a 2012 Rubicon and was considering the 3.73 axle for better milage. I will be using as a daily driver, mostly city and very little off road. Does anyone have an opinion on this?
I'm curious the type of advise you're looking for. its going to get terrible mileage; most folks come to the forums to look for aftermarket help or issues with their stock setup. get whatever you want, if you dont plan on offroading down worry. from a drivers standpoint, the 4.10 gearing will feel more aggressive, and better both on the highway and around the city, due to not having to search in and out of overdrive and general first gear pickup. the mileage difference will be about the same as if you decided to drive without a spare (aka it wont matter). realistically, a sport will get better mileage alone due to having SRA tires (all terrains) instead of the BFGs of the rubi.

the rubi is a bit pricey for a convertible commuter, have you considered a mustang? :-p
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Old 04-05-2012, 03:48 PM   #16
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Originally Posted by sneck

I'm curious the type of advise you're looking for. its going to get terrible mileage; most folks come to the forums to look for aftermarket help or issues with their stock setup. get whatever you want, if you dont plan on offroading down worry. from a drivers standpoint, the 4.10 gearing will feel more aggressive, and better both on the highway and around the city, due to not having to search in and out of overdrive and general first gear pickup. the mileage difference will be about the same as if you decided to drive without a spare (aka it wont matter). realistically, a sport will get better mileage alone due to having SRA tires (all terrains) instead of the BFGs of the rubi.

the rubi is a bit pricey for a convertible commuter, have you considered a mustang? :-p
Lol, have you seen the prices of conv Mustangs? Not cheap either....

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