The fastest I've driven when I was actually driving was around 80 or so on a two lane highway here when my dad said to floor his 2003 Dodge Ram 2500 with a 5.7 liter Hemi. It was a straightaway so nothing to really worry about. He recently traded it in and bought a 2008 Dodge Charger with a 357hp 5.7 liter Hemi, pretty much the same engine that was in his truck. He took it out on the highway to see how she did and got up to 120 and still had room to gallop. That was pushing 3x the speed limit lol. He said it hugged the road pretty decently.
