I'm not sure this thread belongs here, but there is no forum for the 1.4 update.

In Ferrari Faceoff, no gold upgrades are needed to complete the series.

With full R$ upgrades (no gold), the PR's are:

FF:  47.3

458:  51.3

F12:  55.8

The highest PR Cup in the series is 55.

Completing 100% of the series pays 63 GC (8+12+17+26).

The F12 cost 256 GC with the 20% Showcase discount.

I haven't finished the Battle Italia series, nor have I re-done the TT's to reach 100% again in all previous series.  Therefore, I don't know whether the purchase price of the F12 can be recouped.