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  1. smart General Discussion
    My first tank yielded 37.6 mpg. My second tank yielded 35.4 mpg. I checked my third tank mileage and found I azm down to 32.2 mpg. What is going on? * I drive mostly highway miles to and from work. * I only use 91 octane Chevron gasoline. * I am using the automatic D gear more often to...
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