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Hello Loory. I own a 2003 Toyota Matrix 5 speed. In my route back and forth to work I have achieved 47 mpg just from driving techniques (without any physical modifications) according to my scangauge (my mileage log doesn't reflect that as the wife drives it normally). I would recommend against a cold air intake. Instead, a warm air intake would be much better suited to getting you better gas mileage, especially with an automatic transmission since you can't pulse and glide.
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