Board Thread:Game Discussion/@comment-26985937-20160223125756/@comment-26388545-20160227182735

Eddy f. wrote: Nobody knows but firemonkeys at this time.

New Nascar are a little cheaper to upgrade for completion, because of the lowered PR 57 required : 431 GC instead of 722. Rewards are stil 9 for 25%, 14 for 50%, 19 for 75%, 30 for 100% and 50 for sponsors collection. 431-122=309 GC. You can reach 60% with R$ upgrades only.

Net cost is lower than that, see HERE