Question: When did jimmy johnson win his last race?
Disambiguated questions and answers: question: When did jimmy johnson win his very 83rd race?
When did jimmy johnson win his last Busch Grand National series race?
When did jimmy johnson win his very 82nd race?
When did jimmy johnson win his very 81st race?
answer: June 4, 2017
July 14, 2001
April 24, 2017
April 9, 2017
Natural Questions answer: June 4 , 2017 (from the Wikipedia article "List of NASCAR race wins by Jimmie Johnson")