Furthermore, getting gold on the licenses will gift you several cars (automatic gift for silver). Doing the mission challenges will give you a lot Cr. and you get a car at the end of each series. There's currently 10 series I think, so 10 cars in total. You also get a car everyday for driving the allotted distance, namely, Daily Workout, of 27 miles if I recall correctly. 27 miles is doable even if you don't have enough free time.