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Old 01-15-2008, 12:47 AM   #1
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bad bad MPG

ok I know the jeep isn't at all ment for good gas milage but...35 miles for 1/4 of a tank of gas? this really sucks I used to get 210 miles per tank but now I'm not even coming close to that. I replaced the sparks, wires, dist cap, rotor, oil, diff oil and cleaned the air intake. what am I missing? its really starting to piss me off enough to validate going to the dreaded mechanic. I'm going to check for vaccum leaks tomorrow. as far as I know everything is connected and working. any advice on what I should check?
Thanks in advance...

Fox

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Old 01-15-2008, 02:30 AM   #2
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^
Don't feel too bad. Gas companies are using winter blend gas. Your mpg suffers.

My Toyota was consistently getting 35 mpg. But for the past month, due to the winter blend gasoline, I've been getting 27-28. This seems to be the trend every year.

By the way, every time I pass Oregon, I've noticed that you like doing burnouts and doughnuts on the street every time you're at a red light. If you change that behavior, you might get better mpg.




j/k; good luck mate.

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Old 01-15-2008, 06:22 AM   #3
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yeah colder makes it worse, it takes longer to warm up especially when you have the heat on before it is up to about 200 degrees, and also DO NOT run your engine to warm it up before you get in, just get in turn it on, nad stay in a lower gear so you're at about 3K rpm instead of 2K and it will warm up in like 2 miles at most

and also check all your timing and mixture stuff as well, maybe the differetn gas has to do with it and you need to adjust to the gas idk
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Old 01-15-2008, 07:03 AM   #4
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Quote:
Originally Posted by hedonist View Post
^
Don't feel too bad. Gas companies are using winter blend gas. Your mpg suffers.

My Toyota was consistently getting 35 mpg. But for the past month, due to the winter blend gasoline, I've been getting 27-28. This seems to be the trend every year.

By the way, every time I pass Oregon, I've noticed that you like doing burnouts and doughnuts on the street every time you're at a red light. If you change that behavior, you might get better mpg.




j/k; good luck mate.
Wasn't me you can't prove it... when do you pass oregon?

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yeah colder makes it worse, it takes longer to warm up especially when you have the heat on before it is up to about 200 degrees, and also DO NOT run your engine to warm it up before you get in, just get in turn it on, nad stay in a lower gear so you're at about 3K rpm instead of 2K and it will warm up in like 2 miles at most

and also check all your timing and mixture stuff as well, maybe the differetn gas has to do with it and you need to adjust to the gas idk
I always (even if I'm late) let my rig warm up before I go anywhere. the girlfriend hates it cause when she goes to leave somewhere I don't let her leave till whichever car she's taking warms up. timing I don't think is a problem, but I'll check.
I'm gonna pull the sparks later this week and check the gap again. What should they be at just to make sure I'm not gapping them wrong.

Anything else anyone can think of? I'm also gonna put some seafoam in the oil when I get to the auto store. maybe that will help a little...
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Old 01-15-2008, 09:26 AM   #5
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Put a half a bottle of seafoam in the gas tank, too.
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Old 01-15-2008, 10:18 AM   #6
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there's your problem leeting ti warm up, now taht its colder it is taking longer to warm up so you are using gas just sitting and not going anywhere
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Old 01-15-2008, 09:22 PM   #7
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naw it only takes about 10 min so I'm not letting it sit there too long. and I'd rather let it warm up cause if you don't you use more gas driving and its really really hard on the engine.

ya I'll pick up two bottles of sea foam tomorrow and see if that works.
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Old 01-15-2008, 09:25 PM   #8
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My old 98 did this very thing just before the cat plugged up ALL the way. If you have noticed any power loss at all I would check the Cat.
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Old 01-15-2008, 09:28 PM   #9
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thanks for the advice scoob...but I just replaced my cat like 3 weeks ago with a high flow one. so I think that if any thing is gonna block up it would be my muffler.
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Old 01-15-2008, 09:34 PM   #10
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thanks for the advice scoob...but I just replaced my cat like 3 weeks ago with a high flow one. so I think that if any thing is gonna block up it would be my muffler.
Yeh I had to replace both the cat and the muffler when my cat went out.
Since you just put in a new high flow cat, did all teh O2 sensors get hooked back up right. A bad or unhooked O2 would run the engine rich.
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Old 01-15-2008, 10:21 PM   #11
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ya I never unhooked any sensors when I did the swap so I would think that it wouldn't be a problem. I have tomorrow off work so I'll climb under the jeep tomorrow during the alternator install... thanks for the advice.
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Old 01-15-2008, 10:36 PM   #12
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i am havin the same problem with my 99 the mileage is horrible. really thinking about replacing the cat, ive got 76k on the one that i have and figure it might be gettin a bit full. but what i got to thinkin is not only are we runnin winter blend gas, but with winter comes wind and im constantly havin to give my jeep a little more throttle cause of all this stupid wind. i dont know how it is in oregon but here in illinois it gets windy especially in the country parts
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Old 01-15-2008, 10:38 PM   #13
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winds depend around here, lately we have been getting some pretty fun gusts like on the coast 97mph....
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Old 01-15-2008, 10:57 PM   #14
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winds depend around here, lately we have been getting some pretty fun gusts like on the coast 97mph....
if that doesnt make ya jump for joy i dont know what will
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Flowmaster super offroad 44 exhaust
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Old 01-15-2008, 11:06 PM   #15
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if that doesnt make ya jump for joy i dont know what will
getting better gas milage with about 100 more HP oh and some more snow

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