I've lived years in Europe and towards the end I had a 2011 Opel Astra Wagon with a 1.7 turbo-diesel.... I NEVER felt like it needed more power even loaded. It would easily cruise at 160kph (100mph), while getting 45mpg and still have plenty of room to keep accelerating. I also rode in a few taxis that were Mercedes E220CDI and loved them!
Now I know the Astra is no luxury car, but I wish I could buy a new E250CDI here in America, I want the room and luxury, but I have no need for power, I drive 40k miles a year and if I could just get something nice like an E-class that will also get excellent economy I'd be sold.
My Astra dwarfing my cousin's Twingo
What I want: