NONE. The Indy 500 is a 200 lap race with the average fuel stint in that race being 30 laps or more. Several pit stops are required. In the early days of the race, before fuel tanks were standardized, you could put as big a tank in your car as you wanted. And four drivers put enough of a tank in the car to run all 200 laps: Dave Evans in 1931, Cliff Bergere in 1941, and Jimmy Jackson and Johnny Mantz in 1949.
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Lyn St. James finished 32d in the 2000 Indianapolis 500.
The Indy 500 track looks like an oval.
The Indy 500---
Emerson Fittipaldi won the 1993 Indianapolis 500.
Scott Dixon won the 2008 Indianapolis 500.