Board Thread:Game Discussion/@comment-27048832-20170313061510/@comment-26829117-20170313085546

I'm 100% complete so I have the Mercedes and Lotus fully upgraded and the Chevrolet and Porsche only a few upgrades short. I'm usually in Group B with fully upgraded cars so I decided to full upgrade the Chevrolet and Porsche. This cost me around 450 and over the last four weeks I've comfortably been in Group B winning 400. At this rate, I'll be fully upgrading all the WTTT cars at very little net cost.

If you are finding the fully upgraded car harder than you are probably over-driving the corners. Work on hitting the apex and getting on the power earlier and you'll take better advantage of the increased power.