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What kind of mods do you have?? One factor might be where you buy your gas... I noticed a change in gas mileage after I put my CAI on. I can drive a week without running the rpms over 3000 and still only get about 250-275 miles on a tank, and thats using over 13 gallons. I used to get 350-400 miles when it was stock. Winter definetly has an affect on me because of my CAI. My friend lost 100 miles to a tank in his impala with just a CAI and exhaust...dont know how he drove it after he got the mods done though
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