[aerohead]

Technically,a trip strip is any device which acts like a turbulator to trip a laminar boundary layer into a forced transition to turbulent boundary layer,or energize a TBL over a 'fast' contour.
It can be sand glued on,a wire,a bright molding on a Landau roof,dimples,nubs,ribs,micro-vanes,vortex-generators.
The sharp edge on the Prius is a fix to a design problem discovered in the wind tunnel.The original body created bistable flow,buffeting,and noise generation.
The hard edge fixes the separation line to maintain a constant drag coefficient,rather than one which 'hunts.'
Since they extend the elongation of attached flow and pressure recovery,they contribute to higher base pressure and lower pressure drag.All good.
Don't expect any remarkable savings.