Andrew Luck had his best completion percentage in a game when he had 300 or more (YDS+YDS) against the Dolphins on November 25, 2018, at 81.1 percent.

what is andrew luck's highest completion percentage in a+ game with 300+ passing+ yards
Interpreted as:
What is Andrew Luck's highest completion percentage in a+ regular-season game with 300+ passing+ passing yards?

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