Bill Elliott has the fastest qualifying lap in the history of Nascar at an average speed of 212 mph at Talladega Superspeedway in 1987. Restrictor plates were then made mandatory at superspeedways after several horrible crashes, so now modern cars will max out at about 200mph when they are in the draft. If you took the restrictor plate off of a modern car, you could probably reach 230 mph. (estimate)
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A good way to judge this is by looking at the world record holder of the for the 50 freestyle. For a long course pool, this is Cesar Cielo of Brazil. 50 events are usually the shortest events in terms of distance at professional and amateur events, so they are typically the fastest.