The top speed is found by accelerating the vehicle until it reaches top speed. In this example, every 10 mph is shown as well, although this can be customized. Here, the car reached 184.60 mph, however, it reached only 5588 rpm. There is 9.1 more horsepower at 6190 rpm. Would a different gear show an improvement? How would this vehicle perform at a different altitude? Straightline Acceleration Simulator will show you.