How to spot fast trainers on higher levels (lvl 17+)?

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So lvl 17 it is 104 mln, lvl 18 it is 105 mln and lvl 19 is 106 mln

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hmmm, not sure about that.
I 'm lv 16 and I bought fast trainers for 104 M'.
So, it's more logic to be lv17 >105, lv18>106, lv19>107.