Talk:Metal Storage/@comment-24221205-20150713001407/@comment-24221205-20150713002916

Hmmm, I just saw the comment on the Oil Storage page about gold upgrades maybe giving different XP values. I did use gold on this Metal upgrade to level 13. I've currently got an Oil Storage upgrading to level 13. I'll let it finish without resorting to gold to see if what XP value it returns.