I realized I forgot to add a pic of the foil-less 4Runner!
Before:
After:
I took off the foil and mounts and then reattached the screws back into the holes to plug them. If after a tank or two I see an increase, I will go get some washers to help waterproof it a little bit more.
DISCLAIMER: My back window does not roll down, so the benefits of the air foil to keep exhaust out of the cabin is void. I can't get exhaust in the cabin anyway!