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Old August 4th, 2011, 12:37 PM   #21
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6-8, holy shitty batman. My bronco with v8, 33s, and 3.55s gets 12+.

Either you drive like a real asshole, can't do math, or you got something else wrong.
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Old August 4th, 2011, 01:07 PM   #22
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The o2's are both new in nov 2010, mobil 1 every 3500, plugs every 7k. It's well kept, but my milage has been horrible for some time. I thought maybe my skid plate up front was choking the air flow, I removed it and no diff. I do think all the work I did on the front end should have improved it, but then I put the 33's on it right away. I have a hunch my front axel may have issues anyways. It's leaking at the pinion seal and makes noise. I had an issue last year and had to replace the yoke. Also I removed my carpet and hercu lined my interior a few years back and I can't decipher the "normal" noise from the bad.
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Old August 4th, 2011, 01:10 PM   #23
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And FYI, I can't afford to drive like an ass hole at this rate, and I am great at math. I wish my math was the problem. And it has only thrown 1 code in the last few years, and that was from a grounded out wire on the intake temp sensor.
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Old August 4th, 2011, 04:43 PM   #24
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Ya sounds like its not running very well that low of mileage is horrible. I get about 13 mpg and have a tj with armor on 35s and fully locked. I ask ?s about things I don't know about gearing with what tire size and gas mileage I do so let me voice my input. The advice I've gave to him isn't oppsite to what you guys would suggest
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Old August 4th, 2011, 05:06 PM   #25
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It seems to be running great... Unless there is something that could affect my gas consumption that much with out throwing a code or light??
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Old August 4th, 2011, 05:28 PM   #26
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Did you calculate mileage with a non calibrated speedo? And did you measure actual fuel used? This can make a big difference while dealing with small distances. How many miles do you get on a tank, and how much fuel does it take to fill. (not the capacity)
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Old August 4th, 2011, 05:37 PM   #27
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Also, I don't believe a gear change will help mpgs. Its more the tires causing a loss in mpgs then anything else. It sits higher, more rolling resistance and on and on...
keep the 31's for best mileage. As soon as those larger tires are put on you'll never get factory millage no matter what gear you run.
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Old August 5th, 2011, 07:30 AM   #28
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Quote:
Originally Posted by 2fst4you View Post
Ya sounds like its not running very well that low of mileage is horrible. I get about 13 mpg and have a tj with armor on 35s and fully locked. I ask ?s about things I don't know about gearing with what tire size and gas mileage I do so let me voice my input. The advice I've gave to him isn't oppsite to what you guys would suggest
Good answer. Don't let the man put you down.
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Old August 5th, 2011, 07:47 AM   #29
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I find it hilarious when dudes are driving lifted jeeps on big ass tires and then complaining about mileage.

Spending a bunch of money to make your jeep get a few extra mpg's usually ends up in a wash.
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Old August 5th, 2011, 08:54 AM   #30
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Quote:
Originally Posted by Bishop View Post
Also, I don't believe a gear change will help mpgs. Its more the tires causing a loss in mpgs then anything else. It sits higher, more rolling resistance and on and on...
keep the 31's for best mileage. As soon as those larger tires are put on you'll never get factory millage no matter what gear you run.
Exactly! If you are so worried about mileage keep your little tires on maybe lower it or don't drive a jeep. I doubt ur getting that bad of mileage or something is seriously wrong.

Compare your speed on a gps to what it says on the gauge. It probably will be a little higher therefore your going further per tank then it says. Divide how many miles u get per tank by the amount of gals it takes to fill. If you get 10 mpg your most likely getting 11-13
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Old August 5th, 2011, 08:56 AM   #31
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Good answer. Don't let the man put you down.
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Old August 5th, 2011, 09:32 AM   #32
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D
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Old August 5th, 2011, 09:56 AM   #33
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You could remove your AC compressor and fan clutch, I am running two stock elec. fans and moved my alternator up to keep it out of the water. I picked up 2mpg by getting rid of the ran clutch and AC. 97xj, stock gears with lockers, almost bald 33s and 4 inches of lift. Im getting 15 city. The intake and exhaust flow better and I have an aftermarket coil. 75k on the plugs and wires. Good luck!
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Old August 5th, 2011, 09:59 PM   #34
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, plugs every 7k.
What do the plugs look like after 7k miles that you need to change them?
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Old August 8th, 2011, 10:42 AM   #35
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What do the plugs look like after 7k miles that you need to change them?
They are black. Not too bad. I don't change the because they are bad. But I use the copper champion plugs so it's only like $10
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Old August 8th, 2011, 11:40 AM   #36
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http://www.verrill.com/moto/sellingg...colorchart.htm
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Old August 9th, 2011, 06:37 AM   #37
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Quote:
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They are black. Not too bad. I don't change the because they are bad. But I use the copper champion plugs so it's only like $10
don't change your plugs every 7k save your $10 and it will make up for your poor gas mileage. fwiw I did plugs on my new ram at 97k and my parents at 100k and they didn't look bad at all.
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Old August 10th, 2011, 09:16 AM   #38
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Milage is a little bit better now.... I think. I'm getting inconsistent results. I'll keep you posted.
Fwiw, I don't think there is a jeep 4.0 out there that could go 100K on the same plugs with out throwing crazy random cylinder misfire codes. Seems any plug that's not copper does so right away.
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Old August 13th, 2011, 05:41 PM   #39
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dont use champion plugs as they are complete shit.
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Old August 13th, 2011, 06:42 PM   #40
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What temp is the engine running at?
Using the stock 195* temp stat?
The computer may be running open loop
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