hey guy i have recently purchased a 2002 berlina v6 ecotec and to begin with the fuel economy was between 9.8 and 10.2 and would change to how i was driving, now it has been stuck on 12.0 and increased now to 12.3 and does not change at all even driving on the highway, is there anything i can do to fix it or is it something that comes with age??
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