Many GPS systems have preset trip calculations capable of showing your average speed, total distance traveled, time spent moving, time spent stopped, and other information such as;
Shortest Time (fastest time) allows you to calculate your route using shortest distance, considering speed limit factors
Shortest Distance / route determines your best route by shortest distance traveled
Least Use of Freeways calculates your route through city and side streets enabling you to stay off the highways when possible
Most Use of Freeways provides directions over freeways, highways and interstates.