If you’ve ever searched for ways to curb your car’s gas-guzzling appetite, you’ve probably heard that running on cruise control can help reduce your trips to the pump. How? Cars, it turns out, are much better than people at following what control systems experts call a setpoint—in this case, a set speed across varying terrain. Calling upon a branch of mathematics known as fractional calculus, a team of researchers has developed a new setpoint-tracking strategy that can improve the response time and stability of automated systems—and not just those found in your car.