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You really need to study the MetroMPG cars and basjoos's aerocivic threads on this forum. Many cars of the 1990s have that parachute back bumper cover, mine included. But although cars vary, in three and a half years of heavy use of this site, I never remember any of the best experts here suggesting anything other than a belly pan and diffuser as the cure for the bumper-cover parachute. Did you look at the chart of stagnation point and drag changes I post in this thread earlier? If you find your results disappointing on your nose (if) you might want to consider changes that would lift the stagnation point higher, since the ideal point on that chart is significantly higher than your current build. But yours might work wonderfully... as you rightly say... cars vary.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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