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@millforce2k has a good strategy but there are other options.
A green crown promotion costs about 285k sparks. Two red crown promotions or four purple crown promotions cost the same. So if – like me – you like your ABT sandwich peanut buttered on both sides, i.e. two promoted TFs in each squad, you can have have 6 green crowned, 10 red crowned and 28 purple crowned TFs at exactly the same amount of sparks as 18 green crowned TFs.
Another option to use 5,1M sparks, i.e. the cost of 18 green crowned TFs, is to have 6 (or 8 or 10) green crowned and 24 (or 20 or 16) red crowned TFs.
With the first option you (always) get better promotion for two TF event runs although it is not guaranteed that you can kill Boss Pig or Unicron. With the second option you probably get better promotion (on the average).
Just my 0,02€.