Personally, I think any MPH over 75-80 is when you can consciously feel your vehicle moving fast. This guy almost doubled that in a car I've never known to even reach that level of speed without breaking.
A Maine State Trooper stopped a driver doing 29mph over the speed limit in 1993, and the driver freaked out while the trooper remained perfectly calm and courteous.
It's so easy to go 5-10 mph over the speed limit, especially when you're on the highway. I was curious if going 10 mph over is illegal or not. Here's the details.