Temp diff across Radiator

[Colonel]

For a clean radiator, 2 blade fan, working water pump and a 50/50 mix of antifreeze what should one expect to see in temperature difference between the radiator inlet and outlet at say 45mph? I am trying to determine how well my system is or isn't working. I don't have any data or rule of thumb to make judgment. If you have radiator inlet and outlet temperatures those would also be helpful. Thanks