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Old 03-20-2011, 08:02 PM   #1
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Gears?

I have an 08 wrangler, and am looking at going with a 4.5" BDS and putting on 35x12.50x18 and was wondering if anybody knew what the MPG moved to with that, and what it went to if they put in new gears.

thanks

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Old 03-20-2011, 08:10 PM   #2
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this is a touchy subject!!!i have 35-12.5-15 with a 4" lift,456 gearsi get 16-19.theres a guy on here jerry that swears no jeep is going to get that! i think this.its all how ya drive. i dont get that kinda mpg after a couple days of being in the throttle play'n.but decent milage is acheiveable.

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Old 03-20-2011, 08:34 PM   #3
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My 2 door JK is on 35/12.5/15 tire with 4.11 gears. With stock 285/75/16 I averaged 18mpg. The 35's averaged 14. Then I chipped my Jeep and average 16-17 now.

This is street use only though. My REAL average is about 13 or so. Off-road use and 4wd are killers
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Old 03-20-2011, 09:03 PM   #4
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If you are even remotely concerned about gas mileage, do not get larger tires. It will eat at you & eat at you. You will lose sleep, probably lower your immune system.

Have you seen the new Prius'??
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Old 03-20-2011, 09:08 PM   #5
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Quote:
Originally Posted by 07xman2door
if you are even remotely concerned about gas mileage, do not get larger tires. It will eat at you & eat at you. You will lose sleep, probably lower your immune system.

Have you seen the new prius'??
like!
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Old 03-20-2011, 10:08 PM   #6
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My last JK was a two door Rubicon that I put 35" tires on. Stock I got 18 to 20 mpg. With 35" Goodyear MTR w/k tires and 4.10 gears I got 12 mpg. With the 35" Goodyears and 5.38 gears I got 15 mpg. I then changed to 35" Cepek FC II tires, which are an easier rolling AT tread style tire, and gas mileage went up to 16.5 mpg. So part of the gas mileage equation is going to depend on which 35" tires you are running, and an AT tire will get better gas mileage than an MT tire will. Neither will get better gas mileage than the stock tires.

On my current four door Rubicon I changed to 37" tires. This Jeep got 18 mpg stock. With the stock 4.10 gears and 37" tires my mileage dropped to 10 mpg. Changing to 5.38 gears increased gas mileage to 15 mpg.

For gas mileage you won't beat the stock set up. I can't complain about 15 mpg with my 37" tired Jeep though; it is still the best gas mileage of any vehicle we own. My 6.7 Cummins truck gets 14 mpg, and my wife's SRT8 Jeep Grand Cherokee gets 13 mpg. When we are trying to save gas money we take my Rubicon with 37" tires on it, and 5.38 gears. Go figure.
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Old 03-20-2011, 10:35 PM   #7
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Quote:
Originally Posted by MOPWR2U
When we are trying to save gas money we take my Rubicon with 37" tires on it, and 5.38 gears. Go figure.
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Old 03-22-2011, 10:45 PM   #8
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My wife's automatic 4 dr Rubi on a 6" long arm, 37s, and 5.38 gears gets 22-23 mpg at 55 mph. At 70 mph it gets 16-19 mpg-depending on crosswinds and hills.

My 6 speed 2 dr Rubi on a 3.5" lift, 5.13s, and 37s gets over 20 mpg at 55 mph and 16-18 at 70 mph--depending on crosswinds and hills.

With either one, 75 mph drops the mpg to 15-17.
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Hers: 08 JK Rubi 4 dr, auto, 5.38s, Teraflex LA w/ORE/King coilovers, 37" STTs on WE beadlocks, RIPPd
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Old 03-23-2011, 12:31 AM   #9
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Wow...

All you guys are doing better than me.

My Unlimited, 6-speed, with 5.13s and 35s is getting me about 13-14 highway and 16 city
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Old 03-23-2011, 08:45 AM   #10
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^^No kidding. I average about 18 mpgs on the stock 32" BFGs with my JKU, calculated by hand (it'd be about 19.5 according to the computer). Are your numbers using the
onboard computer, or calculated by hand?
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Old 03-23-2011, 09:22 AM   #11
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Originally Posted by u-joint View Post
Wow...

All you guys are doing better than me.

My Unlimited, 6-speed, with 5.13s and 35s is getting me about 13-14 highway and 16 city
If highway means 75-80 mph, 5.13s with a 6 speed and 35s resulting in 13-14 mpg is about right. At 55 mph, I'd bet you'd get close to 20 mpg.

Quote:
Originally Posted by MTH View Post
No kidding. I average about 18 mpgs on the stock 32" BFGs with my JKU, calculated by hand (it'd be about 19.5 according to the computer). Are your numbers using the
onboard computer, or calculated by hand?
Our speedometers are re-programmed with Superchips Flashpaq programmers and GPS verified with my Garmin. Every time I have hand calculated using my Garmin against the odometer, and using the number of gallons to refill the tank, the computer ended up being fairly accurate.

With a non-aerodynamic, brick of a JK, speed makes a huge difference. 18 mpg on a stock Rubi 4 dr with stock tires sounds about right at 70 mph--but not at 80 mph or at 60 mph.
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Old 03-24-2011, 01:36 AM   #12
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Quote:
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If highway means 75-80 mph, 5.13s with a 6 speed and 35s resulting in 13-14 mpg is about right. At 55 mph, I'd bet you'd get close to 20 mpg.
Highway (for me) means 70-75... so, yeah... trash mileage.

I'm sure I could coast along at 55 MPH in 6th, and get awesome mileage...

Part of my problem is where I live. Oklahoma is a frick'n wind tunnel. Even with my gearing, and even with our flat land, if I am driving straight into the wind, it's hard to keep my speed at 70 without down shifting to 5th.
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Old 03-24-2011, 01:37 AM   #13
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Quote:
Originally Posted by MTH View Post
^^No kidding. I average about 18 mpgs on the stock 32" BFGs with my JKU, calculated by hand (it'd be about 19.5 according to the computer). Are your numbers using the
onboard computer, or calculated by hand?
Those numbers are calculated by hand. My JK lacks that fancy little MPG display
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Old 03-24-2011, 08:35 AM   #14
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Originally Posted by u-joint View Post
Highway (for me) means 70-75... so, yeah... trash mileage.

I'm sure I could coast along at 55 MPH in 6th, and get awesome mileage...

Part of my problem is where I live. Oklahoma is a frick'n wind tunnel. Even with my gearing, and even with our flat land, if I am driving straight into the wind, it's hard to keep my speed at 70 without down shifting to 5th.
Try taking off the top, buying some nice goggles & fold down your windshield. These things have the areodynamics of a Lego!!!

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