I used math just to make sure what I observed in real life made sense. I wouldn't just depend on the math for this kind of thing, you get in trouble real fast that way. Read post #55.
Don't tell anyone, but post #55 is where I got the 40% number that I already mentioned as being aforementioned in my question(s) to you...so I'm slightly more than 40% sure that I have already read that post.
I'm not very good at math, myself, but I know a guy that knows a guy that's really good at this kind of thing, so I can probably still figure out whether or not calculating a 40% reduction in the grille's open area is as pointless as you said it is.