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So what do you have planned at the rear of the car ?

As you know, most of a cars drag exists at the rear of the vehicle.

The area around your mirrors has a good amount amount of drag. If not replaced with cameras, replacing the mirrors with something smaller than stock might help.

Smooth wheel covers can also be made and fastened right to the trim ring on the stock wheels. If you dont like the look, you could even use clear plastic sheeting.

By the looks of it, Toyota did a pretty good job of keeping the wheels flush with the body. If you attached smooth wheel covers, you might get the same results as a full wheel skirt, but without the 'odd' looks.

The wheel gaps are small compared to some cars, but you can still add flexible rubber sheeting around this area to seal the gap even more.