Stephen Curry has the highest eFG% when he has had 50 or more (GP/(TM GMS/82)) and with 25.0+ points per game in a season, at 63.0 percent in 2015-16.

highest effective field goal percentage in a season with 25 ppg and 50 gp per 82 team gp
Interpreted as:
highest effective field goal percentage by a player in a season with 25 or higher ppg and 50 or more gp per 82 team gp

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