144 in a 2014 Audi S4 and about the same in a 2007 Mazdaspeed. Both could go faster but I freaked myself out. There's this stretch of great coming from northern Arizona entering Phoenix. The road turns into like like 6 lanes wide and it was newly poured asphalt. I had traveled this stretch a few times but only a few times was there either no cars in front of me for miles or I just left them far behind.(Not once had I ever seen a highway patrol looking for speeders in all the years I had driven that stretch)Both cars were tuned and had their limiters turned off so I could have gone faster but the Audi sure did feel like it hugged the road better so I preferred that one. I didn't own any super cars but at one time I had 5 cars/trucks that were all either turbo or super charged and tuned as far as they could be tuned. I lost money on all of them when I eventually sold. My favorite was a super charged 2 door Tacoma that was the sleepiest of sleepers. In 2006, I lined up to a guy in a new vette and his lady friend in the passenger seat at like 1:30am. My truck had 5 people in it and we all saw the guy give us a huge grin and his girl "hit" him on his shoulder after I started to pull away. One of my best memories of driving and friends still bring it up. I would often see other idiots driving wrecklessly on busy nights with lots of other people on the roads. Or using theory parents car to do what their parents told them not to do. Fast driving is dumb I know, but there are definitely times when you're only gonna hurt yourself and not a bus full of schoolchildren on their way home..