The Passat is not cramped. I had a rare opportunity to ride in the back seat and I had plenty of room (I'm 5"11").

Our Jetta is rated by the Canadian gov't for 51.5 mpg on the highway and it can and does meet that. It is a better comparison to your Civic as the Passat weights 3500 lb.

On top of that, it's a station wagon which is very handy, though I admit rear seat space is a bit tight.

In my daily commuting, if I'm not lead-footed, it can give me over 800 miles per tank of fuel.