and for the "stoopid old man question of the day"................

should one look closely at the .300-.500 [mid ?] lift flows to see how much gain one can get there, as the engine spends a lot of time [especially if used on the street any ?] there ?
i hope i asked the question the way i intended, or as i understand it.
please don't hold this against me if it is not relative to the thread.