Talk:RR3 Wiki:Upgrades Strategy For 100% Completion/@comment-33029580-20180402180056/@comment-26829117-20180404235045

What you are talking about is already built into the strategy. If a car needs to be upgraded further for a later series then the cost of upgrading it for the earlier series is marked as intermediate and it almost always becomes the cheapest car to complete the series (unless there are two intermediate upgrade cars). Also, if a car is upgraded for an earlier series by more than is required for a later series then the later series is marked as complimentary and the costs ignored. If two series require exactly the same upgrades then they are marked as duplicates and only the first upgrades counted (this is effectively just a special case of complimentary).