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 Post subject: Best exhaust for improved MPG's?
PostPosted: Sat Oct 06, 2007 5:16 pm 
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Is there one or is it all about the sound? looking for any tweak for my 05 to get any little bit more out of a gallon.

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PostPosted: Sat Oct 06, 2007 8:57 pm 
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You could try the exhaust from a honda crv :twisted:

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PostPosted: Sat Oct 06, 2007 9:13 pm 
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Any aftermarket exhaust should help alittle.

Best Ive ever gotten is 20.3 figured by hand. The computer reads 21-22 at speeds around 65-75mph at all times.

See sig for specs.

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PostPosted: Sat Oct 06, 2007 9:55 pm 
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Im a fan of magnaflow.They build a good muffler.Gets louder as time goes by(its a glasspack) :)

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 Post subject: MagnaFlo
PostPosted: Sat Oct 06, 2007 10:15 pm 
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I'm not sure of any improvement I had a MagnaFlo installed with in the first week of purchasing my Liberty but the price was a lot more reasonble then the quote I got for Flomaster I can't tell of any changes except it sounded real good.


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PostPosted: Sun Oct 07, 2007 7:51 am 
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what about air intakes for better MPG's and does anybody really believe in those things on eBay that go into your intake tube?

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PostPosted: Sun Oct 07, 2007 9:52 am 
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Putting a restriction in your airtube isn't going to help anything. A cai or exhaust may help mpg a little, but don't buy mods for that reason, you can buy a lot of gas for what they cost. I put on mods because I like them, I like the sound, better throttle response and so on. Better mpg would be just a side benifit. The 2 mods that did the most for mpg on my ranger were, the bama engine programer and swapping in synthetic fluids through out the whole powertrain. I went from 18/22 to 22/24 mpg. There'a a muffler out called the turbin muffler I believe it's called, thats uses some kind of tech to get more mpg and power. I read thier website once, sounded impressive. The factory does a good job of letting the engine breath these days, there is still alittle gain to be had, as the factory mufflers must be quiet and we don't care. I have found that shortie headers are about worthless as the factory exhaust manifolds flow verywell now. Long tube headers, now thats a different story, they will make some power.

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PostPosted: Sun Oct 07, 2007 10:01 am 
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just change muffler out you already have 2.5 inch mandrel bent pipe so just put a borla or magna flow muffler in there. save some money.

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PostPosted: Sun Oct 07, 2007 10:45 am 
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wendell wrote:
Putting a restriction in your airtube isn't going to help anything. A cai or exhaust may help mpg a little, but don't buy mods for that reason, you can buy a lot of gas for what they cost. I put on mods because I like them, I like the sound, better throttle response and so on. Better mpg would be just a side benifit. The 2 mods that did the most for mpg on my ranger were, the bama engine programer and swapping in synthetic fluids through out the whole powertrain. I went from 18/22 to 22/24 mpg. There'a a muffler out called the turbin muffler I believe it's called, thats uses some kind of tech to get more mpg and power. I read thier website once, sounded impressive. The factory does a good job of letting the engine breath these days, there is still alittle gain to be had, as the factory mufflers must be quiet and we don't care. I have found that shortie headers are about worthless as the factory exhaust manifolds flow verywell now. Long tube headers, now thats a different story, they will make some power.


x2 ^
Spend money to get more power, not for better gas milage. It comes set up for good mpg from the factory. About the only thing I can think of that pays for itself quickly is running air from in front, around the radiator and directly into the air box. Less than $10 at a hardware store and just takes a little creativity.

My hood actually gives me an extra 15% mpg on the interstate, but it will practically never pay for itself. For example:

Drive 10,000 miles a year, with 30% interstate driving. That's 3000 interstate miles. At 20 mpg, that's 150 gallons of gas. Save 15%, and I'm down to 127.5 gallons. That's a savings of 22.5 gallons of gas per year on the interstate. However, that's only a savings of $67.50 per year in gas from about $1500 in air intake modifications and the hood. At that rate it takes a little over 22 years to pay for itself in increased mpg.

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 Post subject:
PostPosted: Mon Oct 08, 2007 10:24 am 
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any idea on whether the tow package will decrease your MPG's? my 05 has the tow and gets around 20 but my daughter's 03 does not have the tow a nd gets almost 25.

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PostPosted: Mon Oct 08, 2007 11:28 am 
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DryBones wrote:
any idea on whether the tow package will decrease your MPG's? my 05 has the tow and gets around 20 but my daughter's 03 does not have the tow a nd gets almost 25.


Since I dont own a KJ I aint a guru in what the hell the tow package is but Id assume it includes a tow hitch assembly :lol: . That would add more weight but it aint gonna be a significant difference...anyone fill me in on the KJ tow package deal? It dont come with bigger brakes too does it??

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 Post subject:
PostPosted: Mon Oct 08, 2007 12:07 pm 
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kj in a tight spot wrote:
DryBones wrote:
any idea on whether the tow package will decrease your MPG's? my 05 has the tow and gets around 20 but my daughter's 03 does not have the tow a nd gets almost 25.


Since I dont own a KJ I aint a guru in what the hell the tow package is but Id assume it includes a tow hitch assembly :lol: . That would add more weight but it aint gonna be a significant difference...anyone fill me in on the KJ tow package deal? It dont come with bigger brakes too does it??


I'm not entirely sure, but I think it also comes with a heavy duty transmission cooler, power steering cooler, and a larger fan. Although some KJs already have that same transmission cooler I think. I could be wrong. I'm sure someone will be on here to correct me shortly

I don't see how a towing package would make that much of a difference. Does your daughter drive like my grandmother? That's probably why she gets 25mpg. I need to start driving more like my grandmother if she gets that kind of mileage. :D

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PostPosted: Mon Oct 08, 2007 12:12 pm 
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Gopher wrote:
kj in a tight spot wrote:
DryBones wrote:
any idea on whether the tow package will decrease your MPG's? my 05 has the tow and gets around 20 but my daughter's 03 does not have the tow a nd gets almost 25.


Since I dont own a KJ I aint a guru in what the hell the tow package is but Id assume it includes a tow hitch assembly :lol: . That would add more weight but it aint gonna be a significant difference...anyone fill me in on the KJ tow package deal? It dont come with bigger brakes too does it??


I'm not entirely sure, but I think it also comes with a heavy duty transmission cooler, power steering cooler, and a larger fan.


That makes sense, didnt think of that for some reason. Thats more weight there too, but still I dont think itd be enough for a 5+/- mpg difference...gotta be drivin habits

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PostPosted: Mon Oct 08, 2007 12:59 pm 
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Tow package also includes a belt driven clutch fan which can add a small drag to the engine but hardly enough to make a huge difference.

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 Post subject:
PostPosted: Mon Oct 08, 2007 1:38 pm 
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How long would it take to make up for the cost of install and purchase of a muffler that only nets .5 mpg increase? How close would it be to replacement time when you made up the cost?

I'm feeling too lazy to do the math.

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 Post subject:
PostPosted: Mon Oct 08, 2007 9:32 pm 
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I did the driving on the same route to and from my work in both vehicles and the 03 gets better mileage than the 05. now the 03 only has 28k miles and the 05 has 43k but I can't assume a few more miles would make the difference unless they were hard miles :lol: Oh well, I get around 20 so its a bit better than the Astro van I replaced , plus i have the full time 4 wheel drive for any winter problems so I am not going to worry any more about it. maybe the daughters 03 is just one of those special vehicles that rolls off the line from time to time.
Besides, after reading all the posts here I am getting lift and big tire fever so there goes the MPG's anyway. :wink:

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PostPosted: Mon Oct 08, 2007 9:48 pm 
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Lift fever? Can anyone say J.E.E.P.? Just Empty Every Pocket. It's an addiction. I know I've got lift fever since i got my KJ two months ago. Next thing you know you'll want a roof basket. Good luck with your new addiction (Is there such a thing as Jeeps Anonymous?). :D Welcome to the wonderful world of Jeep!

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 Post subject:
PostPosted: Mon Oct 08, 2007 10:08 pm 
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Gopher wrote:
Lift fever? Can anyone say J.E.E.P.? Just Empty Every Pocket. It's an addiction. I know I've got lift fever since i got my KJ two months ago. Next thing you know you'll want a roof basket. Good luck with your new addiction (Is there such a thing as Jeeps Anonymous?). :D Welcome to the wonderful world of Jeep!


HA, I play mandolin and over at that website they call it MAS, Mandolin Acquistion Syndrome! Same deal, always wanted more,better upgrades. Probably not going tohave a basket, I just added Thule 450 footpads and LB50 load bars to support my Thule Hull-A-Port kayak racks that I was using on my old Astro van. I really can't decide if I should lift this Limited or street trick it with all the chrome I can find. I may have to trade with the wife and lift/off -road the 02 sport. BTW, whats the rule of thumb about lifting/off-roading a limited with an automatic?? Anything goes? :shock:

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