extremely poor gas mileage - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 10-26-2008, 02:17 PM Thread Starter
 
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extremely poor gas mileage

i just bought a factory certified '06 GTO with an auto tranny, bone stock, and i am getting 10 mpg in the city and 12-13 on the highway. ive driven this thing like miss daisy since i got it a week ago, but the gas mileage is still piss poor... anybody have any suggestions? maybe i need to reset the computer or something?

any ideas?
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post #2 of 18 (permalink) Old 10-26-2008, 02:50 PM
 
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Ill go on reset it, its too low maybe the other owner was driving it pretty hard thats why its like that. Good luck.
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post #3 of 18 (permalink) Old 10-26-2008, 03:17 PM
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Find out if the car was tuned. Something is definitely wrong there.

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post #4 of 18 (permalink) Old 10-26-2008, 04:08 PM
 
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Im getting 13 or so on city driving in L.A's Traffic!! How you get that on the highway is beyond me.

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post #5 of 18 (permalink) Old 10-26-2008, 07:05 PM
 
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Take her back and make them go through the car. Best place to start IMO. I get 9 MPG in town, but I know why...
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post #6 of 18 (permalink) Old 10-26-2008, 10:55 PM
 
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Did you reset the computer when you fill up? What octane gas you putting in it?



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post #7 of 18 (permalink) Old 10-27-2008, 06:01 AM
 
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I do mostly city driving and short runs at that and my '06 is getting about 13-14MPG...21+ on the highway...good luck with yours...I agree on trying the reset...
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post #8 of 18 (permalink) Old 10-29-2008, 04:40 PM Thread Starter
 
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I do mostly city driving and short runs at that and my '06 is getting about 13-14MPG...21+ on the highway...good luck with yours...I agree on trying the reset...
Bill
its a stock Ls2 motor and it has not been tuned. How do i go about resetting the computer and whats the idle re-learn and the driving re-learn procedure for this car? i know what it is for my '92 cadillac seville, but that was the OBD-I days, this is a whole different animal...
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post #9 of 18 (permalink) Old 10-29-2008, 06:25 PM
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its a stock Ls2 motor and it has not been tuned. How do i go about resetting the computer and whats the idle re-learn and the driving re-learn procedure for this car? i know what it is for my '92 cadillac seville, but that was the OBD-I days, this is a whole different animal...
Fill your tank up.. then reset your computer. The reset is located behind the steering wheel to the right on the dash beside the radio. Toggle the display until you get to the mpg, then reset it. Gauge your mileage on bypass driving without interruption. Once you get to the point of refilling, do the math manually and see if the figures equal the computer.

The longer you go without resetting the mpg settings the worse mileage you'll get as it will read city, highway combined. Your stop and go driving will drive down the figure.

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post #10 of 18 (permalink) Old 10-30-2008, 07:56 AM
 
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Originally Posted by GTO JUDGE View Post
Fill your tank up.. then reset your computer. The reset is located behind the steering wheel to the right on the dash beside the radio. Toggle the display until you get to the mpg, then reset it. Gauge your mileage on bypass driving without interruption. Once you get to the point of refilling, do the math manually and see if the figures equal the computer.

The longer you go without resetting the mpg settings the worse mileage you'll get as it will read city, highway combined. Your stop and go driving will drive down the figure.
To piggy back on what JUDGE said use your MODE button to toggle and use the SET button to reset.



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