Originally Posted by checkmate
Interesting ze germans didn't consider the technology...we so could've had >20mpg hwy with cylinder activation.
Actually I think Audi did that in their new TT V8.
They all have to do some magic tricks to keep things smooth and expensive feeling, which adds weight and complexity. Vettes have always had mid-twenties highway MPG's, don't see where this one really improves the numbers that much. In the case of the Vette it has more to do with very low weight, very tall gearing (which works well with a torquey engine) and relatively low drag.
When you take a Vette engine and install it into a heavy sedan body, you get a highway fuel economy similar to the M3's.
Anecdotal, but during my Euro Delivery when I was driving very long stretches of highway I was averaging over 21mpg in the M.