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LI Blackdak
Dodge Dakota
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3/19/2002
14:06:29
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 Subject: RE: Gas Mileage...
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i really dont think intakes help. actually i think they make it worse because u are capable of going faster
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Jesse T.
Dodge Dakota
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3/19/2002
14:39:42
| RE: Gas Mileage...
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I was just about to post somthing about this, I am getting only 11.5 to the gal but before i was getting 14.5, what happen, i have had the same mods and now all i have new is cap and rotor and Iat adjuster, It is a 98 slt 3.9 with 3.92 rearend, 3923 plugs, 180t-stat, flowmastercatbacks,iat adjuster, borg warner cap/rotor, air raid intake, I wonder if maybe my plugs are all warn out? or my cone might be dirty?
Jesse
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jr
Dodge Dakota
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5/05/2004
15:30:19
| RE: Gas Mileage...
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I sunk my 98 V6 in the lake and was getting bad gas millage.I changed my o2 sensors and could not believe the difference
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another mark
Dodge Dakota
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5/05/2004
19:20:37
| RE: Gas Mileage...
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Are you kidding me about the 02 sensors fixing your problem? What was the difference in mileage?
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vette22
Dodge Dakota
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5/05/2004
20:20:16
| RE: Gas Mileage...
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A bad O2 will most certainly cause bad gas mileage.
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Vette22
Dodge Dakota
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5/05/2004
20:25:55
| RE: Gas Mileage...
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Wow, amazed to see the low MPG numbers. I get 19 MPG almost all the time. In the cold winter months it may drop down to 17 MPG. I have a 2000 reg cab 4X4.
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Big Dave
Dodge Dakota
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5/06/2004
13:04:14
| RE: Gas Mileage...
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I only get 16 miles a gallon. The only thing that I know could be affecting it is that my throttle body is dirty. How much of a difference would that make in MPG?
P.s. You all have convinced me to have my 02 sensors checked.
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Bob Lincoln
Dodge Dakota
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5/06/2004
21:12:26
| RE: Gas Mileage...
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You can check fault codes yourself, or at Autozone, to see if O2 sensors are bad. A cruddy throttle body can affect mileage some, depends on whether the vacuum ports are clogged, too. 16 isn't awful, but you should do better on the highway.
I just bought my brother's 92 Dakota 3.9L V-6 4-speed auto 4WD club cab with cap, and so far I average 19 mpg. I get about 16 city and 19-20 highway. I just dropped a K&N filter in, changed plugs and gas filter, and ran the first tankful. Unfortunately, the tranny has a problem with delayed or no shift to O/D, as well as lockup sometimes not releasing at stops, so I think the solenoids are bad. Last tankful (first with K&N filter) I drove 264 miles and got 19 mpg. That was with 100 of those miles in one day with no O/D at all, never shifted into 4th on the highway. Imagine I could have gotten 22 mpg or more if I had O/D working.
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TOMZ
Dodge Dakota
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5/06/2004
21:38:07
| RE: Gas Mileage...
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I didn't read all of this post, because most of it is 3 years old! However, O2 sensors will not always throw a code. they most probably are just reading a small percentage of what they did when they were new because their getting filled with carbon deposits.
Contrary to popular belief, you can test an O2 sensor and the readings you get will show that it's working fine. The thing is, it is working fine, it's just so stopped up with deposits it can't determine the true amount of oxegen in the exhaust. Another falicy that has been going around on these forums is that an O2 sensor reads either 1volt or 0volts. This is also false. How else can it tell the computer to enrich or lean the mixture and by what amount. The problem is everyone hooks up a volt meter to the sensor and is done with it. Thes sensors send so many signals a second that only an oscillascope can truely tell if they are working correctly.
Now that I've said all this nonsense I have one more thing to add. ANY of your sensors that are bad, or not working correctly will decrease your fuel efficiency. They all work together as a team to optimize your engines performance. I believe Laryy has mentioned this several times. I also think Bob would agree with this since he seems to have a great deal of knowledge in this area also.
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Bob Lincoln
Dodge Dakota
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5/07/2004
09:03:23
| RE: Gas Mileage...
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Yep. A bad O2 sensor can sometimes be unnoticed except at the gas pump. Mine failed by way of the heating element opening up.
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