Originally Posted by Young

The 55 is supercharged, the first gen 63 (mine) is a naturally aspirated V8 - 507hp. For the 2012 model they switched the 63 to twin turbo at 550hp.

I get 13mpg. The 2012 gets 22

Went to test drive your car (the ctsv coupe) and noticed gas mileage is no better. A trip to the grocery store is $7 in gas Fun to drive though.