Best source for comparing laptimes with others are Sportauto. They always use the same driver. The carmag always present details of of the cars. How they behave on the track, roadconditions, wheather conditions, tires etc etc.
Its a well-known mag and the times Sportauto get are the best resource when comparing with others. I dont pay attention to what the carmaker says. Just talk and no proofe.
Where are the scans and St-anger great write-up?