Board Thread:Game Discussion/@comment-28412524-20160728062309/@comment-27170954-20160728114806

i had the same thoughts, did the same analysis, and came to the the conclusion not to upgrade. The 2013 and 2015 RSRs are still more econimical to upgrade for the respective series. It's a shame, as the GTE is a nice drive.

I'll wait for the 2013 RSR to go on sale again for Masters of Speed. if this is a new pattern, then it is very possible that there will be an upgrades sale for that after it goes on sale again.

Same logic can be applied to the 2015 RSR for Racing Spirit. I have that car, but have not applied any GC upgrades. It will probably go on sale again in the future and maybe there will be an upgrades sale to go with it.