[davelobi]

I'm thinking the back end of the CRX needs something to break up the vacuum of the big flat hatch/bumper area.

One of the big three (thinking Gm but not sure) added a plastic cap to the top of their tailgate on the full sized pick-up. It started as a protector from damage when throwing in lumber etc. They finished it off by letting it hang off the back, past the vertical section, of the tailgate and found it added almost a half of a mile to the gallon.

I'm considering something along those lines. Like a mini spoiler that just goes back, not sticking up. The idea was to allow the air to come together further back behind the car reducing the vacuum. It sort of does, in a small way, what a boat tail would do by reducing drag at the rear of the car. It also actually keeps the back of the car cleaner from sucking dust to the back. This has been used in some of the mini-vans to help keep the back window cleaner.

Has anyone added something like this to their CRX, or any other car, and gotten noticible results?

I'm thinking rubber or plastic that I can stick on the top back edge of the hatch.
Any ideas of what to use? I'm picturing triangle shape and the full width of the hatch. More subtle than a spoiler and not sticking up in the wind.