Originally Posted by indiegeek

Everyone knows about it - So I guess everyone who posted "Ive gone XXXmph" had a Garmin sitting on their dash tracking them?

It's like when I had a bike and everyone talked about going 205mph. No, you didn't. Try 170-180

At 120 I believe my Firebird was 9-12mph off, somewhere around there. It doesn't get bad until high up, obviously, it's a percentage.