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Old 01-06-2011, 01:21 PM   #1
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mpg help cant be this bad

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

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Old 01-06-2011, 01:23 PM   #2
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That might be about right. those 35s have a lot of rolling resistance. Otherwise it could be an O2 sensor starting to go bad. Sometimes they won't throw the code right away. But I suspect it's just the low side of normal. Also what type of driving? Mostly city? Especially with 4.11 and 35s with auto. You should really be geared at least 4.88 I think.

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Old 01-06-2011, 01:24 PM   #3
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Remove the 35s and put stock size back on? jk
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Old 01-06-2011, 01:24 PM   #4
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I'm just gonna take a shot in the dark here but I think your problem could be having 4.11 gears and 35" tall tires on a rolling refrigerator.
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Old 01-06-2011, 01:26 PM   #5
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12-13 DD is what I get.........
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Old 01-06-2011, 01:33 PM   #6
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Thats actually pretty normal for that tire size and gearing on a TJ. It's not like it's an aerodynamic marvel.
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Old 01-06-2011, 01:35 PM   #7
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I think 12 is good for what you're running
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Old 01-06-2011, 01:39 PM   #8
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I get about 15mpg with 33's and 4:56 gears. Make sure your odometer is right or your numbers may be off.
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Old 01-06-2011, 01:56 PM   #9
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Make sure your odometer is right or your numbers may be off.

That's a very good point. Why didn't I think of that?

Your programmer should be able to adjust it for you if you haven't already done that.
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Old 01-06-2011, 02:08 PM   #10
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35's, my friend. That much rubber along with the fact the Wrangler has the aerodynamics of a brick, well.....you're not going to get much better than 12. It's kinda that you can't have your cake and eat it too, thing.
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Old 01-06-2011, 02:15 PM   #11
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35's, 4.10s, and 6spd here and Im getting about 12-13 on average but much less if I do alot of city driving or let the Jeep warm up for some time before jumping in.
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Old 01-06-2011, 02:15 PM   #12
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Regear.. Should help
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Old 01-06-2011, 02:26 PM   #13
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I'm running 35's with 4.88's. I have gotten a best is 16 on highway at 70 mph.
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Old 01-06-2011, 02:34 PM   #14
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mine is really bad i have a stock everything and im getting like 10mpg. how many 02 sensors are on a 01 sarah? does anyone know?
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Old 01-06-2011, 02:39 PM   #15
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mine is really bad i have a stock everything and im getting like 10mpg. how many 02 sensors are on a 01 sarah? does anyone know?
I think its 4 or 5
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Old 01-06-2011, 02:42 PM   #16
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omg realy
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Old 01-06-2011, 02:43 PM   #17
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^^HAHA!!^^ I just instictively tried to kill the bug in your signature!!
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Old 01-06-2011, 02:48 PM   #18
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omg realy
Welcome to the world of emissions and trying to keep up with the standards of Prius's

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^^HAHA!!^^ I just instictively tried to kill the bug in your signature!!
Thats what it is there for
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Old 01-06-2011, 03:16 PM   #19
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mine is really bad i have a stock everything and im getting like 10mpg. how many 02 sensors are on a 01 sarah? does anyone know?
I always thought there were two - one upstream of the cat and one downstream. I think on Cali emissions Jeeps there could be two each way for a total of four. Don't quote me though.
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Old 01-06-2011, 03:19 PM   #20
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My 01 had at least 4 and someone had told me there was a 5th but I never checked for that one
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Old 01-06-2011, 03:43 PM   #21
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If anyone has OpenOffice (Calc) program or Microsoft Excel, you should be able to save this file and open it. I made this Excel spreadsheet to calculate how much gas I use and the cost. Here is the link;

http://www.svnsvs.com/Storage/jeep/MileageCharting.xls

It makes it real easy, you can enter info into the four blue fields (Your MPG, The price of Gas and your miles per day) and it will automatically calculate all of the other fields such as how much gas per day? How much money per day? Per work week? Per month? Per year? etc... It really helps to determine how much different 2 miles per gallon and/or so many cents per gallon really has on your overall spending.

Here is a pic of what the spreadsheet looks like;
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Old 01-06-2011, 04:25 PM   #22
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mine is really bad i have a stock everything and im getting like 10mpg. how many 02 sensors are on a 01 sarah? does anyone know?
I have a 2001 Sahara, auto, 3:07 differential, hardtop, air conditioner, pretty well equipped stock, and I get around 10-12 in town, 10 on the mountain trails, and 16-17 on the highway if its level, no wind, no air conditioner, and staying under 60 MPH.

Jeeps, for some reason, must have the worst MPG on the road. In 1958 I had a 1955 Olds V-8 4 door sedan that I got 22 MPG on the road at 60-65MPH driving back and forth to college, and technology is supposed to have advanced since then. Never could imagine how a nice little 6-cyl engine could only manage 15-17 MPG at the best, and Jeeps are really that heavy either compared to a lot of full sized sedans.
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Old 01-06-2011, 05:42 PM   #23
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[QUOTE=Jp90Talon;970464]Welcome to the world of emissions and trying to keep up with the standards of Prius's



so about how much are they do you know? i got one for my husdands yukon and it was like $60
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Old 01-06-2011, 05:44 PM   #24
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I have a 2001 Sahara, auto, 3:07 differential, hardtop, air conditioner, pretty well equipped stock, and I get around 10-12 in town, 10 on the mountain trails, and 16-17 on the highway if its level, no wind, no air conditioner, and staying under 60 MPH.

Jeeps, for some reason, must have the worst MPG on the road. In 1958 I had a 1955 Olds V-8 4 door sedan that I got 22 MPG on the road at 60-65MPH driving back and forth to college, and technology is supposed to have advanced since then. Never could imagine how a nice little 6-cyl engine could only manage 15-17 MPG at the best, and Jeeps are really that heavy either compared to a lot of full sized sedans.
I have 5sp and its the same no matter what i do.
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Old 01-06-2011, 05:49 PM   #25
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I was getting really crappy gas milage out my Jeep and my husband adjusted the carburetor and it is getting better gas milage. I was getting about 7 miles a gallon I felt like I owned his race car stopping at every gas station, but I am now getting about 11-12 now. Just another idea.
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Old 01-06-2011, 05:52 PM   #26
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To correct the speed on the Rubi you must buy a speed helo. You can't put the little gear in the t-case like u can on the 231's. Get the computer done because it will help with shift points. Since you have an auto with 35's you will need to regear.4.10 would be fine if it was a manual.
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Old 01-06-2011, 05:54 PM   #27
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Quote:
Originally Posted by Shysmommy View Post
I was getting really crappy gas milage out my Jeep and my husband adjusted the carburetor and it is getting better gas milage. I was getting about 7 miles a gallon I felt like I owned his race car stopping at every gas station, but I am now getting about 11-12 now. Just another idea.
Tj's are full injected. O2 sensors adjust everything to keep you from running rich or lean.
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Old 01-06-2011, 06:00 PM   #28
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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
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Old 01-06-2011, 06:12 PM   #29
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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
And here my Cummins gets 17 downhill with a tail-wind. Go figure
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Old 01-06-2011, 06:12 PM   #30
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technology is supposed to have advanced since then
Technology has...considerably in fact. But the aerodynamics are still designed to mimic a 70 year old off-road vehicle

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