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I have a 2005 Aveo. Although I am VERY happy with the reliability of the car for the past 5 years, I have not been satisfied with the mileage. Recently, I noticed that if I don't force the transmission to upshift, it will remain in a lower gear far too long. Since the transmission is so smooth, and the car (engine) is so quiet, I hadn't noticed, but I believe that the delayed shifts hurt my gas mileage. Now that I force the transmission to shift (by lifting off of the gas pedal completely) I have noticed improved (but still not satisfactory) mileage. I think that this is possibly a flaw in the transmission.
I also plan to experiment with MANUALLY shifting the transmission and using the HOLD feature to try for higher mileage.
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