Ferdie:
The Carrera GT´s acceleration and weight figures must´ve been rather on an optimistic side. Assumedly the claimed numbers of 1380 kg are for the lightweight version with the satnat and a/c delete option?
There are actually very little data available out there for the GT in terms of acceleration figures.
One non factory data was a Nurburging lap of 7min29 by Marc Basseng in a standard car.
Actually I'd say 3,9 secs for 0 to 100 kmh is on the conservative side, having said that, the clutch is a pain to manage off the start so it doesn't help.
The amazing figure though is the 0 to 200 kmh in 9.9 secs, I mean, that is still top league by today's standards.
Regarding the weight with all fluids of 1460 kgs, that's still pretty good especially given the power of 612 hp.
All manufacturers weight claims are ultra conservative, I'd be surprised to see a 599 GTO that weighs the official number of 1590 kgs or even a GT3 RS that weights the actual official 1370 kgs.
If you look at the new Lambo V12 for example, official claim is 1590 kgs dry weight, with all fluids, add a comfortable 100 kgs (just the fuel should be 90 kgs so that's super conservative) plus on top of that add the "error margin" of the manufacturers, it's safe to suppose a "on the road" version will be more than 1750 kgs.
With 700 hp, it means its power to weight ratio is actually worse than the 7 years old Carrera GT, even with the latter at 1460 kgs!!!
Where's progress?
Better gearboxes yes, better tyres yes, 4WD system ok, but what we want is less weight!!!
Bad times for fans of NA cars, though. I doubt that NA high-performance cars will have a great future given all those foreseeable legal requirements 
