I don't believe your GPS'd speeds!

[redshift]

Wow it's official, Mazda has entered the supercar arena!

I have seen this before, buddy of mine had one stuck to his sled, a Rev 600, and he got I think it was 638 mph.... ya they ain't that fast are they. The sledheads love GPS, because there is so much trackspin (especially un-studded) that the speedo is almost useless........ but they are still prone to error, sometimes significant error!