140+...Speedo said 150 but my car's top speed is listed at 143, and I was going slightly downhill so it's anyone's guess.

It was absolutely and completely empty on US-78 going from Alabama to Tennessee...so I got all testosterony and opened the taps. The road is like 985 when it turns to 365...big open highway which eventually greets you with traffic lights. I ended up coming back to my senses when I finally came across a red light...and some other lights, but that's a different story that no one will believe anyway.