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Old 02-25-2012, 12:36 AM   #1
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suggestions for better fuel economy

2008 jk wrangler x running 35s with stock gearing, I get around 8mpg town and 10 highway... give or take. Its 6 speed and I usually cruse in 5th about 2000 rpm. I need opinions wether to get it regeared(how low) wether to get ram air intake or cold air? Smaller tires:/

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Old 02-25-2012, 12:38 AM   #2
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damn your only gettin 10 on the hwy i was getting close to that in my mustang with 4.10s lol so what i did was i took it off the street and got another car

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Old 02-25-2012, 01:21 AM   #3
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I have 37's on my 2007 JKU Rubicon. I also am running a Rippmods Gen 2 Stage2 Supercharger. With the stock 4.10 and the Six speed I am actually getting a few more MPG's than I was stock. Average MPG 15-17 city 19-22 highway. The Supercharger is an expensive upgrade but I was suprised at the 1-3 more MPG's I am getting, compared to when the jeep was stock on 32's. I am now considering regearing to 4.88's I have plenty of Power in 4L and power through all of my gears in 2H. But would like a little more zing 3-6 gear.

There are gear and tire charts that should give you some insite on where you need to go as far as gearing.

A formula used to help get a rough Idea of what gears you should run is.

New Tire Size, Multipiled by Old Gear ratio, divided by old tire size.


My Jeep: 37 x 4.10 / 32 = 4.74

The formula for my jeep comes out to 4.74 closest manufactored gear sets are 4.88. That is why I am debating 4.88's

Tire
Gear Ra
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Old 02-25-2012, 04:28 AM   #4
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Old 02-26-2012, 01:59 AM   #5
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Old 02-26-2012, 08:12 AM   #6
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Old 02-26-2012, 09:09 AM   #7
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Old 02-26-2012, 07:14 PM   #8
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Old 02-27-2012, 04:46 PM   #9
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