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post #1 of 54 (permalink) Old 03-11-2014, 10:27 PM Thread Starter
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terrible mpg

hi,
i was wondering if someone could help me out
i got the 07 2.4L about a year ago and it has terrible gas mileage i get about 13 mpg
i drive about 50% city 50% highway
has a lot of miles, 117,000 but i don't think that would effect it too much
has cold air intake from dealership
other then that no upgrades
i don't floor it or over rev it too excesivley
can't figure out whats wrong

Thanks
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post #2 of 54 (permalink) Old 03-20-2014, 11:44 PM
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Replace your air filter and clean the MAF.

When was the last tune up?

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post #3 of 54 (permalink) Old 03-21-2014, 10:33 AM
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My average mpg is 27.0, mostly on suburban roads.


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post #4 of 54 (permalink) Old 03-21-2014, 02:25 PM
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How are you calculating your mileage? via the DIC? or miles driven divided by gallons put in the tank?
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post #5 of 54 (permalink) Old 03-21-2014, 02:43 PM
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Good luck.

Replace the plugs and run a bottle of Techron concentrate through a fresh tank of good fuel; and don't ever buy gasoline at the cheapest no-name place in town.
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post #6 of 54 (permalink) Old 03-21-2014, 03:02 PM
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I suspect the owner hasn't done any maintenance other than oil changes. I'd change all fluids, trans fluid, flush radiator, mobil1 high mileage oil and filter and then find the best tune-up shop to do a thorough tune-up with new plugs and plug wires, air filter' fuel filter. I suspect your car puts out some white smoke due to the inefficiency of burning fuel. And BTW use 93 octane.

Good luck.
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post #7 of 54 (permalink) Old 03-22-2014, 11:04 AM
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Originally Posted by miller11386 View Post
How are you calculating your mileage? via the DIC? or miles driven divided by gallons put in the tank?
The DIC. I haven't reset it in about 5k miles. I'm sure some would argue about the accuracy, but I'm not that concerned about hundreths.


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Limited slip differential
Chrome wheels
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post #8 of 54 (permalink) Old 03-25-2014, 06:23 PM
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Get the tune up & oil done, check the sensor on the cold air intake and only burn 98 Oc. THERE IS NOTHING BUT TIME LEFT.
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post #9 of 54 (permalink) Old 03-26-2014, 07:35 AM
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Originally Posted by Rusty Boltz View Post
The DIC. I haven't reset it in about 5k miles. I'm sure some would argue about the accuracy, but I'm not that concerned about hundreths.
I always found it to be 1-2 MPG off at least. Only time I found it accurate was with the cruise on for an entire tank.
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post #10 of 54 (permalink) Old 03-26-2014, 09:40 AM
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Arrow

We sure are getting a lot of "one post wonders" here lately..

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post #11 of 54 (permalink) Old 03-26-2014, 10:52 AM
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Originally Posted by miller11386 View Post
I always found it to be 1-2 MPG off at least
I certainly agree with Miller, I know my Journey is usually off a large amount. I have resorted to using My Fuelly for both my vehicles. I have kept records for both my cars from the moment I bought them. I find my Sky seems to be average 23 mpg (US gallons) with average driving, not real aggressive but not babying it either. Personally I find "My Fuelly " or that type of site more accurate than the onboard computer.

Terry

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post #12 of 54 (permalink) Old 03-26-2014, 06:31 PM
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I always use the "old fashion" method. Current mileage, filler up, drive, current mileage, filler up.. walla.. Subtract current mileage from previous written mileage = divided by gallons pumped = MPG... simple accurate and the TRUE mileage you got on that tank of gas.. The DIC only give the average since the last time the battery was disconnect, or the ECM was reset.. Over time and its use is what you get with that.. so that number goes up/down consistently.. If mainly hwy driving mileage MPG goes up, if only city driving mileage goes down...AND those numbers are averages, not very accurate as far as what you are getting right now..

Calculating Your Car's Miles Per Gallon (MPG)

1. Fill up your car's gas tank all the way.
2. If your car has a trip odometer, reset it, or record the master odometer mileage.
3. Drive your car as you normally would, and let your gas tank deplete to at least a half of a tank of gas.
4. Get to the gas station and fill your tank again.
5. Record the amount of gas it took to refill the tank.
6. Record the elapsed trip miles or new odometer mileage.

Calculate
Get the miles traveled from the trip odometer, or subtract the original odometer reading from the new one.

Divide the miles traveled by the amount of gallons it took to refill the tank. The result will be your car's average Miles Per Gallon yield for that driving period.

e.g. 312miles 16gallons = 19.5mpg

You can repeat this procedure every time you refill your tank to continue to monitor, and attempt to improve, your gas mileage.

Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. Abraham Lincoln

The Constitution is essentially an obsolete charter of negative liberties. Barack Obama

Last edited by MidniteBlues; 03-26-2014 at 06:37 PM.
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post #13 of 54 (permalink) Old 03-26-2014, 07:14 PM
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Originally Posted by MidniteBlues View Post
We sure are getting a lot of "one post wonders" here lately..
Yeah, I've noticed that as well...
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post #14 of 54 (permalink) Old 03-27-2014, 12:55 AM
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Originally Posted by MidniteBlues View Post
I always use the "old fashion" method.
You could go with everything that MB said because he is correct or you could trust the calculations to www.fuelly.com ..........LOL. I certainly wasn't saying you were wrong MB, I just thought that if the math was bogging you down and you were having some difficulty this is the very simple way of doing it.

Terry

2008 Midnight Blue Saturn Sky
2.4L, DDM Short Shifter, 18" Chrome Wheels, Limited Slip Differential, Sirius Radio/Onstar, Power Seat,
Spoiler, Power Windows, Power Door Locks, Kenwood Stereo, Leather, Windrestrictor, Opel GT Antenna

Last edited by Windancer; 03-27-2014 at 01:00 AM.
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post #15 of 54 (permalink) Old 03-27-2014, 06:05 AM
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Originally Posted by yankeeplayer521 View Post
hi,
i was wondering if someone could help me out
i got the 07 2.4L about a year ago and it has terrible gas mileage i get about 13 mpg
i drive about 50% city 50% highway
has a lot of miles, 117,000 but i don't think that would effect it too much
has cold air intake from dealership
other then that no upgrades
i don't floor it or over rev it too excesivley
can't figure out whats wrong

Thanks
I suspect that you may need a new oxygen sensor. A bad O2 sensor will cause terrible gas mileage.

Also, like everyone else said, check your filter. Also, change your spark plugs if they haven't ever been changed. Make sure to get OEM Ac-Delco iridium plugs and nothing else as the Ac-Delco plugs are the best.

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