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Old 05-02-2013, 03:03 PM   #61
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3-4 mpg with a K&N? I averaged about 12-13 before my K&N. Since installing it I average around 12.1-13.1.

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Old 05-02-2013, 03:09 PM   #62
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This thread has so much BS! A cai is not going to get you any mpg. I have tons of mpg data from before and after my cai and there is no difference. Using the gas gauge is a total waste of time for calculating mpg! the only thing that is legit is that if the ground is not perfectly level, it can alter how much gas goes in the tank by a few gallons. I notice this at a lot of the stations I go to. A couple degree slant will affect how much it takes. I have 72 gas tanks worth of data so far including the top I was using, trip miles, odo, scan gauge data, tires, etc.

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Old 05-02-2013, 03:14 PM   #63
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Even on flat ground, I have to pay attention to how much I get in the tank. Some dispensers shut off sooner than others, and either way I can put a lot more fuel in the tank after the auto shut-off. If I run the nozzle really slow, I can fill it right up to the filler neck, and even over flow it if I'm not careful. Now I'm curious about just how much slope there is at my normal station, but it's quite a bit. Maybe I'll throw the angle finder in the Jeep next time I need fuel just to try to get a general idea.
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Old 05-02-2013, 03:23 PM   #64
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Back in my high school service station working days, I remember a couple of guys who drove trucks with service beds on them. They carried a 4x4 block around with them and they would toss it down and drive the left rear tires up on it so they could cram as much fuel in there as possible
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Old 05-02-2013, 03:26 PM   #65
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I can't help but wonder why half of you guys drive a TJ if you are obsessed with MPG.

Let's face it you're driving something with all the aerodynamics of a brick. If you want high MPG, buy a Prius.

Oh and By the Way, think yourselves lucky you don't live over here where petrol is over $9 a gallon.
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Old 05-02-2013, 03:33 PM   #66
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I can't help but wonder why half of you guys drive a TJ if you are obsessed with MPG.

Let's face it you're driving something with all the aerodynamics of a brick. If you want high MPG, buy a Prius.

Oh and By the Way, think yourselves lucky you don't live over here where petrol is over $9 a gallon.
I'm not obsessed with it, and in fact I think the mileage I do get is pretty respectable, all things considered. I do check my mileage almost every fill up though, because I want to know. If it's suddenly dropped, I want to know if there is an issue. Besides, I can afford the ~10 seconds it takes to check it..
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Old 05-02-2013, 03:44 PM   #67
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I'm not having a go at any individual. It's just that there are so many threads on here about MPG. Whilst I agree that it can be an indication of a problem, it generally has to be a pretty drastic change to do that.

I just accept that my TJ drinks juice like it is going out of fashion, but I completely enjoy the experiences that I have using the fuel that other people's Prius' save.
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Old 05-02-2013, 03:58 PM   #68
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I'm not having a go at any individual. It's just that there are so many threads on here about MPG.
I know, and I agree. I reckon I was justifying my participation in yet another fuel mileage thread..
I don't recall the levelness (yes, that is a word, I checked) of gas station aprons being discussed before, though..
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Old 05-02-2013, 04:35 PM   #69
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I know, and I agree. I reckon I was justifying my participation in yet another fuel mileage thread..
I don't recall the levelness (yes, that is a word, I checked) of gas station aprons being discussed before, though..

I got infinity MPG when AAA towed my jeep under my parents' policy.
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Old 05-02-2013, 06:11 PM   #70
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Repeated this 50 times for about 200 miles.

So you did this about every 4 miles on average?
LMAO...Like to see the answer to this......
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Old 05-02-2013, 06:41 PM   #71
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Of couse it is. Doesn't mean there isn't a slope. I'm surprised you didn't know this- concrete can be poured on a slope. For example, here's my driveway. If you want, I'll stop on my way home in a bit and take a pic of the station where I usually buy gas.
In my previous life I worked on construction crews building gas stations, the dispenser pads are built flat +/- 1% any fall greater than 3%ust have a grated containment basin.. Most all sights opt for flat..
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Old 05-02-2013, 07:21 PM   #72
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I agree.....I'm 19 and my fuel reading that I get from my scan gauge tells me I can get about 28 MPG on the highway. Now I know this is incorrect (people have suggested because I am using a Canadian Gallon or something like that.....i'm from AUS so I have no idea about Gallon's. I work in litres)

I have 35's with a 4.5 inch lift.....not sure if PO previously regeared. I think ge did due to the revs I actually get on the highway.

My point: I drive my TJ and love it. If I drive to work in it or if I drive it out bush I love it....I fill it up when the indicator tells me its nearly empty and that's that. No matter what you're getting I think we can agree on one thing.....we drive saaweeeet cars
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Old 05-02-2013, 07:28 PM   #73
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In my previous life I worked on construction crews building gas stations, the dispenser pads are built flat +/- 1% any fall greater than 3%ust have a grated containment basin.. Most all sights opt for flat..
Yeah, obviously the dispenser pads are flat. In fact, one of the ones at the station that's attached to the shop I run had to be done twice the last time we got new dispensers because it was't level enough after the first pour. Our place is about the most level one in town. I don't buy my fuel there though as I can get it cheaper elsewhere. The station where I buy most of my fuel just isn't very level at all, and yes, there is a containment basin around the low end of the grade. That station has been there since the 50's (old, for this town) but it was completely rebuilt 15 or 20 years ago, and I'm not sure why they didn't grade the lot flatter.


If this station is so un-level, why do I buy my fuel there?
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Old 05-02-2013, 07:55 PM   #74
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I'm not having a go at any individual. It's just that there are so many threads on here about MPG. Whilst I agree that it can be an indication of a problem, it generally has to be a pretty drastic change to do that.

I just accept that my TJ drinks juice like it is going out of fashion, but I completely enjoy the experiences that I have using the fuel that other people's Prius' save.
Worrying about mpg on a Jeep is like worrying about offroad suspension articulation on a Prius.
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Old 05-02-2013, 08:11 PM   #75
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My stock 2000 Sahara got 20 MPG at 160k miles. It now has a zone 4.25" with 33's and gets 15 MPG on the highway using cruise. I think some of you are just horrible at math. For one thing check your F&*^ing speedo with a good GPS. I was nuts on with stock tires but am now off by 4 MPH at highway speed.
Do you have any idea how much that effects your indicated MPG you nitwits?
If I drive from Eugene to Portland which is 106 miles it will only look like you went around 95 miles on the trip odometer.
Top off your tank only till the pump pops and do the same when you top off again(+/- half gallon if your level)
Divide your CORRECTED milage(if you have oversize tires) by how many gallons it took to top it off.......and keep it within a tenth gallon....it matters.
Do this a few times and you will get your actual MPG.
I get 14.5 MPG if I cruise at 70 MPH on relatively flat terrain for the 106 miles.
Yes TJ's get terrible MPG but you re re's are making it look a lot worse than it is.
I travel from junction city to woodburn on I-5 and can only muster around 15 mpg. Anyone saying they get 18-20 mpg with 33 12.50 15's is full of malarky.
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Old 05-02-2013, 09:06 PM   #76
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This thread has so much BS! A cai is not going to get you any mpg. I have tons of mpg data from before and after my cai and there is no difference. Using the gas gauge is a total waste of time for calculating mpg! the only thing that is legit is that if the ground is not perfectly level, it can alter how much gas goes in the tank by a few gallons. I notice this at a lot of the stations I go to. A couple degree slant will affect how much it takes. I have 72 gas tanks worth of data so far including the top I was using, trip miles, odo, scan gauge data, tires, etc.
read the thread before you bash, no mention of cai, or using gauge to caluclate mileage other than you and 1 previous post
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Old 05-02-2013, 09:35 PM   #77
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I'm certainly not "worried" about the fuel economy of my TJ.....It gets better mileage than any of my other Jeeps/ trucks/ 4 wheel drives/ cars ever got..
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Old 05-02-2013, 09:57 PM   #78
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As others have said, no sense worrying about fuel mileage if you drive a TJ.

Fiction sometimes can seem like reality if you want to believe it badly enough though
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Old 05-03-2013, 09:29 AM   #79
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You're right about speedometer accuracy, but to be accurate in your inaccuracy, your speedometer isn't simply off by a certain MPH, it's off by a percentage. The faster you go, the farther it's off. For example, when you're at a dead stop, your speedometer is exactly accurate @ 0 MPH.
I was trying to do the % math yesterday.
So if my speedo says 60 and GPS says 64 is this the right math?
64 divided by 100 equals 6.4......So 4 divided by 6.4 equals .625 or .625 percent error?
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Old 05-03-2013, 09:33 AM   #80
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I was trying to do the % math yesterday.
So if my speedo says 60 and GPS says 64 is this the right math?
64 divided by 100 equals 6.4......So 4 divided by 6.4 equals .625 or .625 percent error?
Definitely not.
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Old 05-03-2013, 10:16 AM   #81
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I was trying to do the % math yesterday.
So if my speedo says 60 and GPS says 64 is this the right math?
64 divided by 100 equals 6.4......So 4 divided by 6.4 equals .625 or .625 percent error?
6.66666% error
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Old 05-03-2013, 10:20 AM   #82
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64 divided by 100 equals 6.4?
=0.64 but nevermind How do you calculate percentage error
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Old 05-03-2013, 10:25 AM   #83
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6.66666% error

Winner!
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Old 05-03-2013, 10:46 AM   #84
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I was trying to do the % math yesterday.
So if my speedo says 60 and GPS says 64 is this the right math?
64 divided by 100 equals 6.4......So 4 divided by 6.4 equals .625 or .625 percent error?
No, just, no.

Anyway I am skeptical about the OP's adaption theory netting that many MPG's, but whatever I guess it is worth a try. 20 MPG's seems way too unlikely.

I know Rubicon's are heavier, but with my Rubicon stock, 5 speed with 31's and 4.10's, I was getting around 15-17 mpg, managed 18mpg with a slight tailwind on the highway once (and <15 with crazy cross winds before too). With my Winch + Plate + Bumper, it has seemingly gone down a bit.

I added a banks exhaust, I still calculate my MPG's every fill up (like someone else mentioned, it is easy to pump another gallon in after it clicks off, so multiple tanks will yield more accurate results). It will be interesting to see if the Bank's does anything for MPG's as some reviews have said. I am going to say it will do absolutely nothing, and I am cool with that.

Sorry OP, no matter what you say, no body is going to believe you. This is a forum, whether you are being truthful or not, ignorant or not, there will always be non-believers. Count me in on a non-believer on this one however.
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Old 05-03-2013, 11:31 AM   #85
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I travel from junction city to woodburn on I-5 and can only muster around 15 mpg. Anyone saying they get 18-20 mpg with 33 12.50 15's is full of malarky.
I just traveled to NM from Denver going down RT 160 over two passes in the San Juan's last night and got 17.5 mpg on 33x10.5 15 so your statement is malarkey. On previous trips going to Trinidad co I get 20mpg.
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Old 05-03-2013, 05:05 PM   #86
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It must have been a lucky week when I got the 20 mpg, conditions perfect.
this tank is getting 17 mpg combined cty hwy
the temp has dropped 40 deg.
windier then chicago,

Here is a thought, why doesn't one of you let me use their computer to catch appropriate mpg?
I will do a study of things I do and record the results.

I only use one gas station, about a mile from my house.
Very level

I know my mpg will not stay at 20, unless all the roads are flattened, wind only blows behind me, the temps stay in the 65-80 range, and no parts wear on my jeep.
I will try replacing the 12 year old o2 sensors too. I am kinda scared to though, that whole if it isn't broke don't fix it thing.
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Old 05-04-2013, 08:56 AM   #87
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And we realize that any jeep with a "15 gallon tank" really has a 19 gallon tank with and extended filler check valve to keep it at 15. Yes, Jeep sold that upgraded capacity for a markup and only had to swap filler check valves. I have a 15 gal tank so i always have an air pocket!

My 4cyl with 33" tires, 4.10's constantly gets 18, today's fill up showed 20. I check every tank, every time. I always fill all the way up and after the click of the pump going off, run it again until it clicks off again, usually another .5 gallon.

From that point I can drive (like this week) 232 miles until I fill up again, same procedure. And even though the gauge is as low as I dare to let it get, it never takes more than 11.5 gallons in my 15 gallon tank.

Moral of the story is, buy a Volt (GO 'merica!)

Also, there is a switch over of winter blend fuel to summer blend in the swing climate states, and if they are selling winter blend, and you have an unseasonably warm week...you will get better MPG's....throw that into the calculations....
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Old 05-04-2013, 12:42 PM   #88
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readin this thread has made me question some things ppl have said vs the experince/schooling for my degree in automotive tech.....I AM NOT BASHING ANYONE nor do i mean to offend but here goes


#1 toping off your tank after the pump "clicks off" can damage the EVAP system on new vehicals i cant rember exactly what it does as ive been out of school for 5years
topping off the tank will actually throw a MIL light on the newer F-150s at work

#2 when the OP described the prosses of disconnecting the bat cable this will not harm any electronics this is a procedure we have used many time where i work it simply clears stored memory you can also remove bolth + & - and tape them together for 10 min without turning key on or light on

#3 when the OPposted "repeated 50 times for 200 miles i belaeve he ment 50 key starts run to operating temp) in 200 miles. driving easy ie no heavy throttle most vehicles will rember the last 50-100-200 key starts (chevrolets at at the highest of the list) by clearing the memory of the computer the 1st 50 key starts will "reprogram" the jeeps driving style however in my experance this has never been a notacible change at least for the jeep

anyway theres my .02 hope i didnt pi** anyone off
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Old 05-04-2013, 03:32 PM   #89
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I agree.....I'm 19 and my fuel reading that I get from my scan gauge tells me I can get about 28 MPG on the highway. Now I know this is incorrect (people have suggested because I am using a Canadian Gallon or something like that.....i'm from AUS so I have no idea about Gallon's. I work in litres)

I have 35's with a 4.5 inch lift.....not sure if PO previously regeared. I think ge did due to the revs I actually get on the highway.

My point: I drive my TJ and love it. If I drive to work in it or if I drive it out bush I love it....I fill it up when the indicator tells me its nearly empty and that's that. No matter what you're getting I think we can agree on one thing.....we drive saaweeeet cars
Well Played!!!! If you are worried about gas then you dont need a jeep!
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Old 05-06-2013, 02:34 PM   #90
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Who said it wasn't possible??
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