Board Thread:Game Discussion/@comment-28017985-20161224172821/@comment-27464400-20161225212909

It depends on how many upgrades you will have to buy to win the cars: High Voltage 53 RP recommended LTS 53 RP most likely (?) Gauntlet 53 RP recommended (?)

According to the discussion on the Experience page, it costs about 100 gold coins to upgrade the cars to 55 RP! Which is just about the amount you get back from winning the sponsorship deals. Plus you get the regular gold coins from finishing the series. So if you can afford to upgrade the cars to 53RP, the experience series looks like a nobrainer to me.