Well thats easy to look at... you have .80 more of a liter of displacement( 2 more nice cylinders ) and then add to the equation that you are turning 3.71 Gears as compared to the 3800 SC at 2.93.... This will make a difference in the mileage numbers..
Speed will also make the difference..
But I will say it again, just drive them both... You'll know when you gut feels right about the car.. If you feel good about it get it
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