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All the discounts are unknown but there maybe will be a discount in Tanki's birthday.
Daily Crystals Bonus are random. Good Luck !
The D/L is Destroy/Loss.
For example, if you have 1 Destroy and 2 Loss it gonna show you .50
So, it always shows you the rate of how many tanks you destroyed.
Contact and tell them you want to change your nickname. 
Also, changing nickname cost 100 000!