[Big Dave]

Aerohead is probably right. Anair dam plus a belly pan would give the best MPG.

I modified my air dam this summer. It was 3 inches above grade and it grounded at the least provocation (like braking or the steps in my driveway). It worked really well. It was worth at least 0.75 MPG.

But I got tired of listening to it grind, so I shortened it up to 9 inches above grade.

Now it doesn't drag or look dorky, but it is nearly worthless in improving MPG.

I'm trying to learn GIMP so I can shrink down my pix to a size the site can handle.