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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 help@tankionline.com and tell them you want to change your nickname. 
Also, changing nickname cost 100 000!