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Sprint car races use to run much longer distances, USAC used to run 100 lappers all the time. With a large tank and no wings, like alot of early WoO shows were it wouldn't be that hard to run a 150 lapper on that small of a track, would have been less than 50 miles total plus the engines didn't use as much fuel back then and tires were alot harder, lasting several races instead of a few laps. A sprint car can STILL run alot of laps even today, look at the Little 500 for an example, 500 laps with 2 pitstops means you need to run up to 200 laps nonstop. CAN be done with bigger tanks, harder tires etc.
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