Here's a new one to the mix...
My fuel tank went up on its own accord to very good.
I have not developed another, nor have I researched it further and today it has dropped as others appear to increase.
Does this mean the levels are individually affected by general development factor as a whole for your team? ie, spending effort one one single area has a lowering affect elsewhere immediately?
Or is there a deterioration element so that you can't get levels to superb and leave them, they need constant refreshing?
Or are they linked to other teams progress?
I'd imagine they have deterioration, which again complements the idea of making a consistently superb car or parts slightly hard by means of taking longer to achieve (thus fewer people have them, not impossible, but harder than before).