Board Thread:Game Discussion/@comment-25512194-20150124005109/@comment-26388545-20150730035159

Leckie337 wrote: This for me is a want to have all cars however, that will stop well short of completing every race on every level as I will have to fork out 26 GC just to hit 50% on concept car clash which will probably only earn me half that. Not a good return on investment and there are a lot of high value upgrades required just to get to 75% on a lot of races

You can get past 75% on almost every series without gold upgrades, but you often need every car. The only series I have encountered that I couldn't get past 50% without gold upgrades were the ones with only one car. Granted,some of the $R upgrades are very expensive. I just spent over 1,000,000 on stage 2 upgrades for the Porshce 911 RSR 2015.