This is a sad thing thing with owners blinded to a particular marque .
No test is independent enough , no driver is good enough , no other car can be as fast , and they instinctively know the actual times the car can do better than the factory , the independent testers , the myriad of owners that have driven the cars etc etc etc .
Luckily I don't suffer from this and am old/ experienced enough to appreciate a car for what it is . 728 is no shame at all for a car with this breadth of abilities ( its 10 seconds faster than the 458 by the same driver , in similar conditions , on the same track with similar time spent in the cars ) but I guess some owners won't be happy unless the car beats bellofs overall lap record at the ring and the f1 record at spa .
The time is around 728 ( however many excuses you invent the fans of the other cars can create as many ) there are a couple of faster cars but most are slower , enjoy your cars and move on gents