Attaining highway speeds is the greatest amount of work for the engine, by and large, once at that speed maintaining it is much less work. Just works the instant MPG on any newer vehicle for confirmation. Once at highway speeds, most vehicles have adequate passive cooling. Now on the VX, there is not a lot of surface area for that kind of airflow. I've contemplated cutting some air vents on the front fascia, but that would be towards the end of my checklist.