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I disagree.
As in the example of the racing Fusion, going "out back" instead of up should reduce the area of the rear of the vehicle that experiences turbulence MORE than going "up", hence it should be a more effective drag reducer and fe increaser. After all, if the rear edge of this extension (no matter if it goes up and/or back) goes out to the "template", the rear window/over the trunk zone should "see" decent flow as in pickups with tonneaus.
I would go so far as to say, don't raise the lid at all, just go back... but it may have to go back unacceptably far to reach the template outline... THAT is when you consider raising it.
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