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I'm no where near good enough in math to figure this one out other than to say that there is no way there is 36 hp worth of pumping loss.
I think that the actual formula would use vacuum and the cross section of the throttle opening, which is where the vacuum is being generated.
If I had to pull a number out of my ass, I would guess than pumping loss for a saturn being driven at 60 mph on level ground with a constant throttle opening, is somewhere around 5-10 hp. Likely closer to 5.
There are all sorts of smartypants on this board that know this kinda stuff backwards. i am sure one will chime in soon with a proper answer.
This topic does bring up the idea (again!) of using some sort of turbine as a throttle for constant power O/P like cruising on the highway.
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