135 mph. I was cruising comfortably at 100 mph and passed a suburban that was modified. It had a dually rear end and sounded like it had at least a modified exhaust. As I passed him, he gunned it and we were off! He kept up with me until 120 mph but I wanted to let him know that his brut of vehicle was no match for a SVT contour on the open road. I looked down at speedometer at I was going 135 mph and the suburban was far back in my rear view mirror. I will never do that again. Going at that speed is too dangerous on public roads.