Talk:Bugatti Championship/@comment-108.59.136.34-20170412005916/@comment-27893266-20170412204139

Zenith Series page says:

"In the series, there are five cars for the player to choose from, which can be used in other racing series as well. Originally, only the Bugatti Veyron 16.4, Pagani Zonda R and Koenigsegg Agera R were in this series. The Ferrari LaFerrari and Bugatti Veyron 16.4 Grand Sport Vitesse were added later."

So, if you played Zenith series before the adding of LaFerrari, or the GSV, you may have collected the 100% reward before, so now you would get only 3GC reward.