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to start off, i'm not too sure about the bulbs. u may have to find that info from your local DMV. as for your gas miliage, YES, your filter has a LOT to do with ur gas miliage. ALWAYS change your filter every 300 miles along with your oil. if you live in a dusty area, like a desert, u may have to change it more often. also, use a HIGH OCTANE gas. i like to use Cheveron myself. another thing that affects it is driving habits. the longer you stay in the high RPMs (4K-5K), the more gas you're gonna burn. i get about 33MPG Hwy. which is about the best you can get from a malibu. but i plan to get a Tonado device to see if that changes anything.
remember, your engine needs to breathe. if it can't get air to mix with the gas, it's gonna burn more gas.
DeeJay
majin-BU
Z-II-Z-ist
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