Originally Posted by Thirteendog
I never drive above 70

but I in my opinion the car in theory would handle very nicely all the way up till its governed speed of 145. Of course this is all just theory. I never drive above 70 mph.

The car has a governor? 145 mph and 5k tack?
I did hit Hwy 840 yesterday with a friend. He drives an '87 Porsche 911. He got a ticked a week ago and wasn't willing to open up. But, he did spot for me. We couldn't find an area that was straight and long enough with out quickly coming to a curve or hill that could hide a speed trap. Also, traffic was a little heavier that I was comfortable with.
I only got the car up to 128 and I went from accelerating to breaking... I simply ran out of road "
for my comfort level."

Even with the crosswinds, and there were a few gusts, my XF felt rock solid, but I was not able to cruise for any length of time.
There is always tomorrow. I know I can hit 140 without breaking a sweat.
When I had my 92 Eclipse AWD, I took it up to 125 a couple times. Made me nervous, though the car handled ok. Had a little shake at that speed. However, with the XF sticking to the ground as it does, I felt confident in avoiding disaster at higher speeds.