I recieved a nice little tip from Joe Hansen today. Hopefully I wont muck it up too bad trying to pass it on. :) His advise was to conserve L4 resonators as much as possible. The reason being, from L6 on, you will need four L4 resonators for every portal. So as I understand it, if you want to claim a portal that is unclaimed, it will take four L4 resonators before the portal will be powered (Correct my understand if I am wrong Joe). Something else I was unaware of that I will include in this tip, is that portal levels are based on an average rounded down. So, a portal with two L6 resonators, two L5's, two L3's & two L2's = L4 Portal (2x6 + 2x5 + 2x3 + 2x2 = 32/8 = 4). When you couple the two tips together, you see how you can avoid burning through your L4 resonators while still powering the portal up to an L4 portal. *Updated* per Joe's clarification.