[aerohead]

The Vx will have a wagon type wake,of generally homogeneous makeup.The sedan may produce counter-rotating vortices off the back of the trunk,with higher induced drag,requiring a longer period for viscous attrition to wear them down,all paid for by underhood power and fuel.Each body style has it's own merits,however in the case of the Civics,it looks like the wagon edges out the notchback by a nose.Hucho's book has images of all wake forms and is sure worth the look!