Board Thread:Game Discussion/@comment-28176594-20160629005220/@comment-26829117-20180114123342

So the facts so far are:
 * The refill button refills all drive for 2
 * The forth drive costs 20
 * The fifth drive costs 40
 * The first drive refills in 16 minutes
 * The second drive refills in 18 minutes
 * The third drive refills in 18 minutes
 * I suspect the forth and fifth refill in 18 minutes but you'll have to wait an hour to find out :-D