Cooling issue on highway

See, that's why I like electrics. When I don't need my fans, they're not running. Way more efficient without all that parasitic drag. My fans pretty much never run unless I'm stopped, going light to light in traffic, or it's 110°F. And even when it's 110° they shut off if I can sustain 35mph or so for more than a few minutes at a time.
I seriously doubt it takes even 2hp to drive a solid blade fan. But you are correct. It does take "something".