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Old Jun 8, 2010 | 11:56 AM
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Question WTF is going on?

What could be making me get low gas mileage? I drove about 60miles and consumed 1/2 a tank of fuel. WTF is going on?
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Old Jun 8, 2010 | 12:28 PM
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Tune up? How old are spark plugs? Driven like a race car driver or old man? Add some long tube headers. Get a 6 speed....or a diff DD lol.
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Old Jun 8, 2010 | 12:32 PM
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plugs are original i think...would that hurt my gas mileage alot? I have taken it to the local track 5 or six times
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Old Jun 8, 2010 | 12:34 PM
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Won't 02 sensors mess with gas mileage? Also, is your air filter, fuel filter, and Mass air flow sensor clean?
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Old Jun 8, 2010 | 12:42 PM
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Alot can mess with mpg, the engine running noticably rougher? I mean we can sit here and speculate lol but can't really narrow anything down tyl you look into it more :-)
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Old Jun 8, 2010 | 01:57 PM
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Tune up, air in the tires, air filter, little less heavy of a foot.
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Old Jun 8, 2010 | 02:12 PM
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I gotta argee with the guys saying that we don't have enough info.

Almost anything can cause poor MPG. If you have no other symptoms besides gas mileage, then start with the basics and go from there (basics meaning even as simple as tire pressures, as mentioned above).
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Old Jun 8, 2010 | 05:15 PM
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Someone is siphoning your tank . Just wait till you catch them and BAM get them with a fork in the eye
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Old Jun 8, 2010 | 06:39 PM
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maybe your fuel gauge is off.
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Old Jun 8, 2010 | 06:57 PM
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the motor seems to idle a little ruff and on the dyno showed slight hesitation.
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Old Jun 8, 2010 | 07:06 PM
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id start with maintenance items and go from there.
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Old Jun 8, 2010 | 07:24 PM
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I agree. Proper maintenance is a must!!

New Plugs
wires
air filter
fuel filter
Clean the MAF (MAF cleaner sold at most parts stores i.e. O'Reilly's, etc)
O2 sensors could also be going bad. Have the car scanned for those. they can get expensive but you really only need the front two.
Tire pressure helps more than you'd think
Think that's about it. Depending on the mileage on your car, I would replace all fluids as well. Tranny, rear, motor oil, and coolant. Those don't really affect your gas mileage, but a properly maintained vehicle is less likely to cause problems down the road. If after all of that you still experience bad mpg's then you either need to reevaluate your driving habits or have a tuner look at it.
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Old Jun 8, 2010 | 07:43 PM
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bad maf will cause this, though it should be throwing a code for this.
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Old Jun 9, 2010 | 12:47 PM
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Originally Posted by blue98Z
I agree. Proper maintenance is a must!!

New Plugs
wires
air filter
fuel filter
Clean the MAF (MAF cleaner sold at most parts stores i.e. O'Reilly's, etc)
O2 sensors could also be going bad. Have the car scanned for those. they can get expensive but you really only need the front two.
Tire pressure helps more than you'd think
Think that's about it. Depending on the mileage on your car, I would replace all fluids as well. Tranny, rear, motor oil, and coolant. Those don't really affect your gas mileage, but a properly maintained vehicle is less likely to cause problems down the road. If after all of that you still experience bad mpg's then you either need to reevaluate your driving habits or have a tuner look at it.
The car is about to hit the 100k mark. What are some good lubes to install to help keep the car running smoothly? I want to do a full tune up. I need info on spark plugs,wires,lubes for tranny,differencial lubes ect...For a stock car that will be modded in the near future.
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Old Jun 9, 2010 | 01:19 PM
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I would change plugs and clean MAF. Then I would take battery cable off to reset computer so it can relearn. If problem persist I would change o2 sensers.
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Old Jun 12, 2010 | 06:55 PM
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Originally Posted by Dragman
I would change plugs and clean MAF. Then I would take battery cable off to reset computer so it can relearn. If problem persist I would change o2 sensers.
good advice
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Old Jun 13, 2010 | 12:23 PM
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Originally Posted by wicked383lt1
What could be making me get low gas mileage? I drove about 60miles and consumed 1/2 a tank of fuel. WTF is going on?
Hole in the tank? haha!
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Old Jun 13, 2010 | 08:25 PM
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Originally Posted by supersick99z
Hole in the tank? haha!
That's what I thought at first!
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Old Jun 14, 2010 | 04:14 PM
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What do you run, a powerglide and 4.11's. . . . ?


Do your maintanance and see what you find.
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Old Jun 15, 2010 | 05:43 PM
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No...I run a ganstaglide and 4.20's with a flux capasitor. LOL
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