[sailed2japan]

I'm looking to extend the air dam on my 2006 Dodge Ram. Currently the bottom of the air dam is 16 inches off the ground, but I am curious as to what point the additional frontal area outweighs the drag reduction. I am also planning to do a belly pan on the truck at some point in time. I figure I'll start at the front and work my way back. Any research or experience that can be shared so i can get a starting point for building and testing is appreciated.