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how fast are you driving? and what are your rpm's at 45,50,55,60,65 mph? a few tips pump your tires up,drive slow,accelerate slowly,purchase a k & n air filter,use only synthetic motor oil and try to find gas without ethanol, i just broke my highway mpg record in a 2006 chevy malibu automatic 53.45mpg driving 210 miles at 43mph!
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