Hi Fast Freddy, yes stock BBS wheels, mine has 1800+ on it. Manufactured Jan,05 got it November 05. Haven't compared w/ GPS my guess as compared on several run w/ Porsche, Audi & other Japanese Cars seems OK, probably 5% difference Max. Unlike the Italian Lamborghini'S speedo !0% higher readings.
with your stock height tires and so little miles on them i bet you accuracy is within + or - 2% like mine is :thumbsup
5% off i highly doubt.