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Originally Posted by GMPG
That wing is an ugly piece of carp is what it is... several tank to tank tests over the same route (several round trips per tank, Ultra gauge and pump calculation) show no difference
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That's the difficulty of tank-to-tank comparisons.
It sure would be interesting to study it more though. Given the poor angles/shape of the rear of the car, it's definitely not a slam dunk which would be better.
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Are there any tricks to get the air to reattach to the rear window that "should" work?
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Not really.
The common solutions when you have early separation at the rear and want to make a smaller/more organized trailing wake are:
1) make a kammback
2) raise the entire decklid height
3) properly positioned/angled spoiler
Just for kicks, I'd also add to your list: taper & square off the rear corners of the bumper to promote clean separation there. This aero mod is turning up on lots of higher-efficiency designs, like the Prius, Volt, Honda Fit EV. Position them so there's some taper (~10 degrees would be safe) leading to the added "corner".
20 minutes to make with duct tape & some rigid bendable material.
EG: Honda Fit's rear bumper:
