I believe that engines in Europe are generally more efficient, and the USA manufacturers are starting to use similar technology and trumpet it as "all new and i

I believe that engines in Europe are generally more efficient, and the USA manufacturers are starting to use similar technology and trumpet it as "all new and improved!!" The fact that European car manufacturers are unable to export their cars unaltered to the United States is due to the fact that European cars fail to meet U.S. smog-emission standards. Manufacturers do not, and cannot because of U.S. smog-emission laws, use European engine technologies in cars for the U.S. market. They have to come up with "new and improved", as you say, technologies that meet U.S. smog-emission standards while achieving whatever other goals they have in mind (fuel-economy, performance, reliability, smoothness, driveability, quietness, etc.).