Stephen Curry has the highest eFG% with 50+ games played and 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
Interpreted as:
highest effective field goal percentage by a player in a season with 25 or higher ppg and 50 or more gp

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