Board Thread:Game Discussion/@comment-28176594-20160629005220/@comment-26829117-20180112162644

You are correct, if a little over optimistic:
 * Refill for 2 GC - refills one drive point only I think
 * Increase Maximum Drive for 20 GC will increase your drive to 4 forever

I would never bother with the first one. It's only 30s or so to refill a drive point. The 5th drive point is 40 or 50GC I think. Again, it's not much point increasing them but if you have the spare GC it is something to tick off.