Upgrading a single item to lvl 16, you may need to spend 100k uridium and it gives you 6% of damage and 15% shield power. Now if you like to spend your hard earned uridium effectively, then suppose you want to upgrade your drone, then upgrade all the 8 drones to lvl2 by spending 31240 uridium and you get 16 x 1% sheild = 16% total shield power and if you upgrade 31 LF3s to lvl2, then you get damage of 0.4 x 31 = 12.4% damage of total by spending 121055. So according to me, the more effective way of upgrading your items is level up all the items to lvl2 first and after lvl2 upgradation is over then next step is to upgrade to lvl3 of all items and so on, thus your damage and sheild power you gain will be more than just spending more than 100K for upgradation of single item to lvl 16.
If you are an avid boxer, then here are the few tips for increasing your boxing capacity, using pet is the best bet for earning more uridium: First you will need to buy an auto looter for your pet and if you willing to invest uridium then never get lvl1 autolooter, it is just waste of uridium as the range of it is very limited and your pet tends to move around your ship and will try to pick only those boxes which your ship can pick without any assistance of the pet. So, the best option would be to go for lvl2 or lvl3 autolooter, lvl3 would be the best, but it costs 37500 uridium, but it worth buying it, then you need to buy salvage protocol lvl2 or lvl3, lvl1 gives you 1% more from the boxes, lvl2 gives 2% and lvl3 gives 3%, thus if you get lvl3 salvage protocol and you fill your pet slots with 10 lvl3 protocol you will get 30% more from the boxes i.e. in 4-x maps if you get uridium of 150 then your pet may turn it into 195 uridium thus your earnings are more. Investing so much uridium in pet is recommended to only those people who are avid boxer and always box in pvp maps, in other maps it would not show much difference and it would be just waste of uridium. If you are not an avid boxer in pvp maps, then instead of investing so much of uridium in salvage protocol and auto-looter is just waste, instead you need to invest in kamazaki lvl3 and should have premium account to make full use of it in earning uridium, just by cubing, which may give more 150 to 200 uridium per cube kill.
Now the above mentioned technique of upgrading pet for collecting uridium does not worth the amount of uridium you have spent for upgrading your pet, thus cubing is the best way to get more uridium than any other kind of boxing.
Another option for earning uridium is by going to uridium page and clicking earn uridium cash for action, this will lead to advertisers and you would need to do surveys and some downloads inorder to receive uridium.
If you are an avid boxer, then here are the few tips for increasing your boxing capacity, using pet is the best bet for earning more uridium: First you will need to buy an auto looter for your pet and if you willing to invest uridium then never get lvl1 autolooter, it is just waste of uridium as the range of it is very limited and your pet tends to move around your ship and will try to pick only those boxes which your ship can pick without any assistance of the pet. So, the best option would be to go for lvl2 or lvl3 autolooter, lvl3 would be the best, but it costs 37500 uridium, but it worth buying it, then you need to buy salvage protocol lvl2 or lvl3, lvl1 gives you 1% more from the boxes, lvl2 gives 2% and lvl3 gives 3%, thus if you get lvl3 salvage protocol and you fill your pet slots with 10 lvl3 protocol you will get 30% more from the boxes i.e. in 4-x maps if you get uridium of 150 then your pet may turn it into 195 uridium thus your earnings are more. Investing so much uridium in pet is recommended to only those people who are avid boxer and always box in pvp maps, in other maps it would not show much difference and it would be just waste of uridium. If you are not an avid boxer in pvp maps, then instead of investing so much of uridium in salvage protocol and auto-looter is just waste, instead you need to invest in kamazaki lvl3 and should have premium account to make full use of it in earning uridium, just by cubing, which may give more 150 to 200 uridium per cube kill.
Now the above mentioned technique of upgrading pet for collecting uridium does not worth the amount of uridium you have spent for upgrading your pet, thus cubing is the best way to get more uridium than any other kind of boxing.
Another option for earning uridium is by going to uridium page and clicking earn uridium cash for action, this will lead to advertisers and you would need to do surveys and some downloads inorder to receive uridium.