Board Thread:Game Discussion/@comment-112.210.235.18-20170606121930/@comment-31374292-20170608122900

You don't have to fully upgrade the cars for finishing the two series.

Only PR55 is necessary which means that you can neglect the final two suspension upgrades on all the three cars.

You can earn 300 (sponsors in FE experience) + 75 (FE experience completion bonuses) + 72 (FE showcase completion bonuses) gold.

If you are smart, you can earn some more gold in the ongoing FE Time Trial Competition.