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Old 01-06-2011, 06:17 PM   #31
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I have 35s, 5-speed, 6-cylinder (and my odometer is correct) and I was getting about 14 MPG and then I bought something from O'Reilly's called "Sea-Foam" and I put it in my Jeep..and I was talking to a dodge salesman who said that the dodge cummins gets the most power and what not at 2200 RPM so I thought, thats an I6, mine is an I6, why not try to keep my RPM around 2200 and see what happens..and after putting in the sea-foam and a days worth of driving at 2000-2400 RPM I filled up the next day and my Jeep had been getting 19.2 MPG after the Sea-Foam and new RPMs
I've got 33's on 6cyl auto and I've been getting around 12-13...gps tells me my speedo is reading slower than actual speed so my mileage is a little better than advertised.

But I remember reading a post about someone not using the 4th gear (O/D) and getting better mileage.

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Old 01-06-2011, 07:16 PM   #32
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X2 on the seafoam. You need to keep the injectors clean.

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Old 01-06-2011, 07:45 PM   #33
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Get it calibrated and then check mileage. My odometer is slow with 33's. My Jeep actually travels 11 miles when the odometer shows 10.
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Old 01-06-2011, 07:51 PM   #34
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05 Rubi, 4,10 and 35s, speedo right on and getting 14-16 in mixed driving including 70 or so on the highway.
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Old 01-06-2011, 07:53 PM   #35
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i get 14mpgs on 32s with 4.11s
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Old 01-06-2011, 07:58 PM   #36
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X2 on the seafoam. You need to keep the injectors clean.
While that's what Seafoam and the other manufacturers of various fuel injector cleaners want everyone to believe, they aren't mentioning that virtually all of today's modern gasolines contain more than enough fuel injector cleaning additives to keep the injectors sparkling clean.

Clogged injectors with today's domestic gasolines produced in the U.S. is pretty much a thing of the past.

Save your $$$, you don't need to add Seafoam or other fuel injector cleaning additives, you're already paying for them when you buy gasoline that now contains enough to keep the injectors clean. That didn't used to be the case, fuel injectors used to clog up pretty easily starting in the 60's when gasolines weren't formulated for fuel injection. I used to go through a lot of injector cleaning additives back then. But that was then, this is now. Really.
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Old 01-06-2011, 08:29 PM   #37
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Jerry I usually agree with you but you must be listening to the hype from the gas companies. Gasoline is as varied as every Jeep out there and the quality control at the pump can be very different than when it left the refinery. Something to clean the fuel system, from my experience, has been beneficial.
I've tried several brands of fuel and there are some that will give terrible gas mileage.
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Old 01-06-2011, 08:42 PM   #38
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Jerry I usually agree with you but you must be listening to the hype from the gas companies.
Nope, but it sure sounds like you are listening to Seafoam's hype.

I used to have 20-25+ car and Jeep dealerships as clients and over the years, I casually asked pretty much every mechanic at those dealerships how often they had seen truly dirty or clogged fuel injectors. The newer mechanics never had, the older mechanics all said it had been years since they have seen a clogged or dirty fuel injector.

Since I haven't used a fuel injector cleaner in 25 years, and I drive 40K miles a year as an outside salesman, I haven't had a single clogged injector and most of my vehicles I keep for well over 100K miles. My last TJ had 191K miles on it before it was stolen and its injectors never needed any cleaners. That is certainly enough to keep me from swallowing the hype that says we need to use Seafoam or other injector cleaning additives. There's not a major brand of gasoline produced in the U.S. manufactured for cars that doesn't contain sufficient amounts of fuel injector cleaning additives to negate the need to use aftermarket cleaners. It's the aftermarket that keeps trying to convince us otherwise but, then, they are simply trying to sell us their products.
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Old 01-06-2011, 08:54 PM   #39
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I started using it at the recommendation of a mechanic about 6 years ago. There was no hype and I had never heard of it. It worked then and been using it in every vehicle I've owned since (twice a year). The gas companies can claim their gas is great but like I said, every now and then they pump junk.

If your jeep is getting bad gas mileage...try a can (doesn't need to be seafoam). If it's running great...leave it alone.
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Old 01-06-2011, 08:57 PM   #40
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How do you know it is doing anything at all? The fact that you use an additive doesn't prove it is doing anything at all. Some mechanic may have recommended it to you but I know mechanics who erroneously recommend we fill our tires to the air pressure molded onto the sidewall too. The title of "mechanic" does not necessarily indicate any particular degree of competence beyond changing spark plugs and not always even that. Few mechanics are all that well educated either and quite often are only one step ahead of their customers in terms of true automotive competence.
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Old 01-06-2011, 09:29 PM   #41
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This "mechanic" was the one with the experience and expertise that the certificates on the wall validated and the customers that use and recommend a class shop with 20 employees. Yes, I'll listen. Gas is better than what it was years ago but the tanks it's being pumped from are mostly still the same.
I'l keep using it on my 99 with 150,000 miles getting 15 mpg. Something is keeping it going.
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Old 01-06-2011, 11:08 PM   #42
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May not be the answer but for what it is worth. I just changed the air filter, plugs and oil on my TJ and last tank got 16.8MPG versus the 11.9 I had been seeing. Plugs removed did not look bad, filter was a little dirty oil was at it interval but did not look too bad. Used Castrol Syntec this time around and a Mopar filter.
Jeep has just over 100k and I have only owned it for a feew months. Not sure of PO maintenance but can say not a scratch of dirt under her and runs smooth as new. Hope this helps.
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Old 01-06-2011, 11:21 PM   #43
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Quote:
Originally Posted by h2obill

I've got 33's on 6cyl auto and I've been getting around 12-13...gps tells me my speedo is reading slower than actual speed so my mileage is a little better than advertised.

But I remember reading a post about someone not using the 4th gear (O/D) and getting better mileage.
About a month ago, I completely quit using 5th gear in my 99. With 31s and 3.07s, it was no good. Even at 70 on the highway, I was only turning little over 2k in 5th....not a good place to be under a load for the 4.0

I began only using 4th and brought my speed down a little to about 65, putting my RPMs at 2400-2500 and I saw a big increase in gas mileage. I have no numbers but it was very significant.

Just my 2 cents
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Old 01-07-2011, 07:27 AM   #44
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About a month ago, I completely quit using 5th gear in my 99. With 31s and 3.07s, it was no good. Even at 70 on the highway, I was only turning little over 2k in 5th....not a good place to be under a load for the 4.0

I began only using 4th and brought my speed down a little to about 65, putting my RPMs at 2400-2500 and I saw a big increase in gas mileage. I have no numbers but it was very significant.

Just my 2 cents
I've just started doing this recently. I only use 5th going down hill and when there is no wind. Jeep seems to like it better, but with the cold mornings and running the jeep for a few minutes to warm it up in the morning is keeping it about the same. Also jsut switched to synthetic, but I don't expect to see a change from that until after my next oil change.
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Old 01-07-2011, 07:29 AM   #45
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And here my Cummins gets 17 downhill with a tail-wind. Go figure
Mine gets 17 with a bad transmission. It doesn't want to shift.
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Old 01-07-2011, 07:45 AM   #46
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I have an X model with rubi 31's, 5 speed manual and I get an average of 21.4 mpg. I work in downtown Dallas and my commute is about an hour each way. My Brother has a TJ rubicon with 3" lift, 33's and a 5 speed manual with the chip and he gets 17 mpg on average and he also works downtown.
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Old 01-07-2011, 07:47 AM   #47
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I guess Ill have to regear at some point I put 4.88s in my jk 6sp and 35s and got about 16mpg.

I do mix driving not to much city 25% city 75% back rural roads and highway 70ish

I tried the 91 performance setting on the superchips and was avg. 14 but i dont know if its worth the extra gas money

would a exhaust help?
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Old 01-07-2011, 07:59 AM   #48
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Im averaging 12mpg anyway to get to 15 or 16 mpg.

I have a kn intake superchips programmer set on 87 performance
411 gears 35" tires and auto

any ideas
It's a JEEP THING....you better understand...bottom line is we all bought Jeeps for pleasure and their capabilities not for mpg..I'm not trying to be a smart ---but I had to come to this conclusion just like every one else. I am glad to pay the difference if my Jeep gives me the pleasure of getting away from the daily BS that we all go though and keeps me from going postal....LOL (small trade off)
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Old 01-07-2011, 08:24 AM   #49
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I tried the 91 performance setting on the superchips and was avg. 14 but i dont know if its worth the extra gas money
Running a higher octane than the engine was designed for will not improve mpg. All you're doing is paying more for your gasoline than you need to.
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Old 01-07-2011, 12:38 PM   #50
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Just checked mine with 33's and I got 17.2mpg
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Old 01-07-2011, 12:52 PM   #51
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aerodynamics have some to do with it, but alot of it is when you lift one, install larger tires, and even change the gears, it still takes HP to move it all. The jeep in my sig got 15 on 38's, 4.56 gears, and a stroked v8

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