how fast it really is – navi results !

hy mein v70 bj. 11/99 2,4t automatik original 193ps als tacho mit den originalen 205/50/16 als tacho 255 auf 230-240 ist er flott der rest pulls up a little bit, is with chip certainly better? now I measured with the navi, but with winter wheels limited (210kmh) and larger wheels 205 55 16, so a little more rolling circumference and thus less tacholügen result 200 on the tacho were despite the larger wheels 197 als navi (garmin660) what are your values?