Board Thread:Game Discussion/@comment-27109924-20151225110945/@comment-26249703-20151229144038

You're welcome. Not all information came from me, though and there are still a few uncertainties :) the guide is ever-changing as series sometimes reduce their PR etc. So in the future, Hypercar Charge may require PR:84 for example which would mean the upgrades were redundant.

As an example, Concept Car Clash reduced its max PR from 88 to 86 (I think, from memory) when the Asterion was added, reducing the upgrades cost from 492 to 304.