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Old 06-26-2014, 06:57 AM   #1
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2015 mileage

Would it help on my 2015 two door if I changed the exhaust and added a unrestricted air filter with mileage?

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Old 06-26-2014, 06:59 AM   #2
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Jeeps never get good mileage, they push too much wind

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Old 06-26-2014, 07:02 AM   #3
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Originally Posted by billp911 View Post
Would it help on my 2015 two door if I changed the exhaust and added a unrestricted air filter with mileage?
No, this will make it worse in all likelyhood, and will certainly reduce the lifespan of your engine. There is NOTHING you can do to improve the mileage of the JK, besides maybe putting tires off of a Prius on it, removing the back seat, getting rid of the spare...In other words, if MPG concerns you that much, buy a car instead.
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Old 06-26-2014, 07:26 AM   #4
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"Good" mileage is relative. I have experienced slight improvement in MPG's with the use of ethanol-free fuel.
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Old 06-26-2014, 10:15 AM   #5
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If there is any benefit, you wouldn't notice it. The usual trend with a wrangler is more time = more mods which in turn = worse gas mileage....

Just enjoy the ride and the fact you drive one of the most unique vehicles in today's market!
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Old 06-26-2014, 11:37 AM   #6
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Agreed with everyone above.

Replacing those things only helps if the factory systems are bottlenecks...these aren't.
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Old 06-26-2014, 11:46 AM   #7
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The engineers at Chrysler/Jeep have doubtless labored long and hard to get the mileage and emissions (noise as well as CO & NO) down on your Jeep. Back pressure, resonance of the entire exhaust system for best catalytic performance, etc, has been optimized with your factory kit. Replacing much of this for a different sound or some power gain at the expense of mileage and emissions is available in the aftermarket, but as lame as you may thing the MOPAR stuff is, it's all there for a reason, they didn't just pull it out of a "lowest bidder order" and slap it on.

In the news is the Prez and EPA going for better fuel economy in the future, so you should be reading into that changes will be coming to the Wrangler - might be the Diesel is the card up the sleeve they've been holding out on will come into play as such regulations appear (or we all get a loverly guzzler tax.)
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Old 06-26-2014, 11:57 AM   #8
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Jeeps never get good mileage, they push too much wind
Compared to the 7mpg I was getting. 16-20 is heavenly.

But I have to disagree with intake and exhaust worsening mpg.

If you get a tuner, intake and exhaust. You will, at least in my experience, gain a couple mpg.

Engineers have to keep volume in consideration when designing the air flow through an engine. To quiet an engine requires restrictive measures. The general public usually doesn't want a loud vehicle, so the engineers have to play a balancing act, you do not.

I can tell you now that to get the volume down on the v6, requires significant restriction to do so. My 350z is a 3.5l v6, and though the vq36de is inherently a louder engine than the pentastar, my 350z is deafening in comparison. Sometime I can't even tell of my jeep is even running.

Just my opinion, but if you didn't give a crap about volume, deleted the muffler entirely, ran a true dual 3" exhaust with long tube headers, routed the intake out of the engine bay and behind the bumper, then bought a programmer and tweaked it, you would definitely pick up a few mpg. But it would be SIGNIFICANTLY louder.

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