Mazda had a much smarter plan by cooling the EGR gasses significantly, allowing them to not have to dump fuel to cool the cylinders. It worked very well, too in the real world, as most of us CX5 turbo owners see far better than EPA. I'm sitting on 26.4mpg lifetime, while the vehicle is only rated at 27 hwy. Just like Mazda said, it kills its EPA ratings. Most review magazines saw the same thing, with it getting 30+ doing 75 on the freeway.