samj_13Manufacturer races, Driving Missions, and Special Conditions hall.
Mayuri OotsukaThe Car makers own events tend to be pretty short, so will give you more completion percentage for less on track miles. The Japanese zone will be best value for money as the cars tend to be cheap and the prize cash rewarding.
FamineNo. Everything gives equal percentage - though not necessarily for equal effort (Nurburgring 24 Hour Endurance gives the same percentage as Driving Mission 1).
Pink_the_FloydErrr, *cough* Quite a dumb question *cough*