Haha - that GS link shows the grille block on Dan's old Del Sol. Dan owns a Prius as well, and posts here once in a while (krousdb).
By the way, welcome to the site, Winston!
If you're doing primarily highway commuting (and it sounds like you are), lowering the car will help very slightly. Lexus calculated a one inch drop reduced Cd on the LS400 (I believe) by .01. That may gain you (guesstimating) 1-2 mpg @ 60 mph.
So, don't do it for the financial impact, though there may be other motivation.
There are lots of mods you can do to a Prius in addition to these.
And it's great to read someone's surprise at the savings from just slowing down. That's priceless!
And just the beginning - the Prius responds particularly well to a motivated right foot. There's more fuel economy where that came from!