New Cooling/fan question

Any type of fan is an impediment to airflow on the highway, and belt-driven fans rob HP. Not much, but still. I run a cheap little plastic fan from Summit on my Duster that is 4 inches too small in diameter (by conventional wisdom). It take very minimal power, blocks less airflow at highway speeds and pulls just enough air at idle to prevent overheating while sitting in traffic on a hot day.

I like to think of it as an optimal unconventional compromise.