Cooling issue on highway

Don't let the facts get in the way of a good story:
- some years ago, Hayden or Flex-a-Lite or one of the fan companies had flow figures on their website. A 19" seven blade mech fan pulled 6000+ cfm. Have not seen an elec fan get close to that.
- newer cars have generally smaller engines. So less coolant to cool than say a 440 [ 7.2L ], smaller fan work ok.
- newer cars using elec fans also have the luxury of detonation sensors; just pull out some timing if that small fan cannot stop the pinging. Our old iron doesn't have that ability. Therefore, the cooling system [ & fan ] needs to be capable of handling the worst case scenario. Not a job for a low output elec fan.
- newer cars run higher compression. That actually lowers temp, not raises it.
- there are going to be power losses in the drivetrain before the car moves. Losses from the alt, trans, p/s pump, & fan, etc.