I posted back in July that I made two runs to rev limiter in 5th and that the speedo showed 177 mph. On the way to Route 66 last week, I compared my speedo to GPS at 60, 80, and 100 mph and it showed my speedo was dead on. I assume it would also have shown it dead on at 177, but maybe there is some tire growth at that speed. I was hoping my speedo read slow so I could have claimed to belong to the 180 club. Oh well, 177 will suffice.