Answered January 12th, 2020

Since 1980, Dwight Gooden has the lowest fielding-independent pitching with 250.0+ innings pitched in a season, with a FIP of 2.12 in 1985.

best fip by a pitcher with 250 ip in a season since 1980
Interpreted as:
best fip by a pitcher with 250 or more ip in a season since 1980

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