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correct me if im wrong, dont the new cpu's that run the cars modify on the fly and learn your driving habits . also do you have a realtime fuel readout on the dash, if not a scangauge will help .It did for me now Im getting +3-4mpg with out thinking about it more if I work at it. And welcome to ecomodder. by the way It seams all the older cars and trucks got better mpg. lighter smaller engines fewer bell and whistles.
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