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2004 Base Deville; 1998 D'Elegance
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I get 28 mpg on straight highway driving. In city driving (lots of stop and go but on 50 mph roads) I get between 19-22 mpg. I have a 1998 Deville. Found I get better gas mileage here in Phoenix than I did in Cleveland, Ohio. During the winter there, my gas mileage was much lower.
 
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