Thread:RR3 Michael P/@comment-26335320-20160505091748/@comment-208.184.141.147-20160505173307

Yes, it is possible. You only need PR 55 (55.4) to get far enough to get the sponsorships. That gets you to 87% of each of the series, though I think the last Title Sponsorship may happen at about 83%. The rest is a matter of repeating earlier races to get the more readily available sponsorships. At that point you can decide when/whether to spend the additional 160GCs to finish to 100% (190 for the last three cheapest upgrades to get to 57 less the 30 GC bonus for 100%).

4CG