Board Thread:Game Discussion/@comment-35757312-20190116160819/@comment-36438036-20190122191007

AFAIK, you 'only' need the P1 at PR 81.0 to clear Vertex Spirit. That will cost 120GC.

True indeed: I chose not to purchase the Renault RS1 as R$ was more scarce to me at the time and it cost only 64Gc more to clear Vertex Spirit that way. But you are right that the overall Gc minimum required to pass involves buying the Rs1 for upwards of R$ 1.6 Million.

Resultantly, I'm not personally sure if progressing through McLaren Generations with just 81Pr is possible, but I'm sure the wiki can sort that out. Upgrading the P1 from 81 to 82 will certainly be cheaper than purchasing any of the other Gc-only McLarens in that series.