I got the 4.6 and really love the power and smooth shifting. Mostly it was what was available in a color I likes (White/Black). I believe the 4.6 has some more amenities that are options or not available on the 3.8. It is an extremely quiet car, although the ride is a little rough compared to my previous M35. In addition to the up front extra cost of the 4.6, of course it'll cost more at the pump. But when you step on the gas getting on the highway and see items get smaller in your mirror...
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