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Reading load, injector readings, fuel pressure, travel speed, etc directly from the ECU and looking at datalogs, it takes ~25hp to go 65mph steady on a flat road with a drag coefficient of 0.35 in my coupe. 70mph takes ~30hp. Going up a reasonable incline at 60mph takes 60hp. Tires 225/60r16. This is all at a low ~1500-1600rpm's with some very efficient small valve/high velocity heads/intake that make huge torque (400+ ft lbs) from just past idle up to 5500 rpm's at WOT before tapering off.
I would say your 36hp calculations are pretty close to accurate.
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