Losi madness is right it really depends on your battery and other set up.
But if i had to tell you something general i'd put it like this. According to my pinion testing (and i do organized timed testing on spreadsheets), I tend to get 4-5% more run time per tooth down, until i reach such a high torque that I am getting such excessive wheelspin then it actually gets worse.
On my Mugen with my 1900kv 4s, diminishing returns or reversal of time happens around 12 or 13T. That can be different for your car, track condition and driving style, so take that with a grain of salt.
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