Talk:Elixir Collector/@comment-24628980-20140309060505/@comment-24673921-20140312132744

Neither I'm afraid. The upgrade effectively cancels the boost and you lose any time remaining. Its always a good idea to time your upgrades to start when the boost stops rather than cancelling a boost as, whilst boosted, it can produce more elixer than an upgraded collector of the next level. Its worth noting that the same logic applies gold collectors too.