I’ve gone fast (for me), usually on a race track. I have discovered that after a certain speed, I don’t feel like I’m completely in control and I slow down to where I feel comfortable. There’s a point where I’d suggest turning interstates into autobahns where there is no speed limit. Darwin will prevail. Then again, that might be the first step to turning thing into something like “Along the Scenic Route” by Harlan Ellison, so maybe not.
I recall finally getting to drive (a few feet) on the Bonneville Salt Flats, it wasn’t fast, but the pictures were nice.