Enter MILESANDMILES when editing a license. Decline when asked to confirm the changes.
Completed Game
Enter ENTIRETY as a license plate name to get a 100% game completion. Choose to decline when prompted to confirm the changes.
Winning races
In the missions where you must receive an "A" or greater rank by coming in third or better during a race, use the split in the highway section in the road after and before each stage to advance your position. Most racers will go a bit slower here, and if you have a fast car like the F40, you can easily overtake competitors on the straights and easy bends of this section.