Good info...
Cutting out or filling that rear portion would be a permanent cut into the bumper, so good to know.
I'll take a look at the Prius for inspiration.
Aero effects really hit a harsh reality lately with strong winds. I may get bolder with trying new aero treatments (currently not a whole lot going on in that department).
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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