If you read up on it (the car, not the pulse), you will find that it used a fan that blew out the back.
I suspect why they never tested it on the road is that it threw up everything lying on the road at cars behind them, and realized that it was never going to work. The problems with sucking from the top were that there was a need for a rear view mirror and also the associated lift problem, and it was quietly shelved.
Not sure what the Cd of the thing was, but it solved the rear turbulence thing that the boattail solves by blowing air out the back.
I remember that Pulse "autocycle" ! That thing is an awesome concept, I really find it discouraging that there wasn't more of a public reception of it as a practical commuter than there was.
Well, over 300 sold, which is not bad considering that he was a private outfit and not a huge corporate behemoth that can afford to have dealerships in every town and saturation TV, magazine and newspaper advertising. I'm surprised he sold that many, to be honest.
Good point Mighty Mira, I do see what you are saying. And yes, for a private and very small organization, 300 is actually pretty good.
What I guess I'm more surprised at is that there was no response from the large-scale automotive manufacturers to provide a similar concept to the public. Politics and profits ruin many grand ideas I suppose.