[orange4boy]

If half of the HP required to drive 55 is to push the car through the air, it stands to reason that there is a lot of HP available to redirect to the problem of form drag. Specifically, reduction in the form of pressure redistribution.

For example, If 50% of your drag at 55 is pressure drag, then a car that takes 20hp to go 55 would have 5hp to burn to break even. Using any less would be an improvement. 5hp to run a high flow turbine is a lot. I'll bet in the above story, they are using about a centrifugal compressor, not a piston compressor. If you run it off the exhaust, then you even use some waste heat and have even more hp to play with.

I was toying with the idea of a hole thru my van a while back and this makes that idea seem less crazy that it did at the time. Pressurize the air in that duct and you have something.