What HT/HS is ideal?

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Little by little we are moving to the 0w-20 oils. Other then Redline's, most 20wt. oils have lower HT/HS numbers. Ford Mustang's call for a 20wt. oil. Wouldn't you think using a 20wt. oil with a HT/HS number of around 2.8 would be to low for this type of car? I don't think we have any UOA of such a case but it seems like it would be. Or what about the new Ford pickups calling for 20wts.? I think I'm asking a question we just don't know yet.
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we've seen some decent UOA's of the motorcraft 5w-20 , and the Honda 5w-20 on this site, not quite sure what their HT/HS numbers are. I was impressed the 5w-20 Motorcraft was working as well as it did in the Ford pick up truck engines. Not quite Mustangs but still fairly large hard working Ford engines.
 
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