all well documented. BMW and Porsche and Ferrari's are notoriously optimistist. These are all as measured on certified GPS and have been documented by all magazines. Both Euro and US publications.
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Originally Posted by WagnerX5
Question, how do you guys know these percentages? Did you have yourselves clocked like a trap speed? Seems like a lot of "estimation" work here. No offense. I am very aware, from my law enforcement buddies, that speedometers over 75 mph can sometimes be off a few notches. However, my track friends (those who love to run the 1320) have checked before and the speedometer seems to be right where their trap speeds were....so again, how are we getting this percentage of deviation?
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