Have heard that the 480 has a slight edge in daytime, and at night it has a decisive margin. Why did they go narrow bodyIJIJIJ Sure the airstream will make up some of the gap, but physics is physics....
I don't know about 480R vs 580R, but out here a 580 will kill a 480 any time, anywhere. I guess the limiting factor is different, because all our crops are swathed.