Very interesting, thanks Pud! I wonder what induction and exhaust they use. I suspect it's not as circuitous as the induction/exhaust on the Brera/159! The Brera floorpan is a bit of a shag for the exhaust to be routed around.
There's no way of telling really, I wouldn't think. I doubt they hook up the PAS and aircon systems though, so there's a few less pullies to turn.
I wonder how much loss at the tyres/rollers the rolling roads actually have. Well at least we know how much gain we are getting, since the same rolling road is used before and after.
I don't think it is possible to measure transmission losses accurately, because friction is not one-directional. When powering up, friction in the transmission is sapping energy, meaning some engine power is being lost in the process of accelerating the transmission components. But when doing the coast down, the same friction is still sapping energy. Because it is unknown force in both cases I don't think it is possible to accurately distinguish it from normal transmission losses due to the rotational acceleration of masses (cogs, gears, flywheel, clutch plate, driveshafts, wheels, tyres etc).
However, thats not to say rolling roads are useless. Given fairly scientific test conditions, even if the figures themselves are not spot on, comparisons between two sets of figures can be drawn. The second result is higher than the first, this is a measurement to back up the feeling that the car is quicker/smoother. If you didn't know how much you weighed, and someone put a backpack of unknown weight on your back, you'd still know you weighed more. If you get me.
I agree with your point, less emphasis should be placed on the figures measured, and more should be placed on the gains made. As that is what matters in the end.