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I'm currently at 8,759 miles with one trip of about 4,000 miles to the east coast and back. Overall average mileage is 18 mpg (OnStar.) My current tank is 17 mpg. I average anywhere from 14 to 17 mpg on each tank of city driving to/from work and how much I push the long pedal into that wonderful supercharger!
Tara
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Old and new, sharing space!
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