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Example from what I see at my track(and my Mychron data)
Legal World formula at Phoenix Kart (PKRA, normal sprint kart track, skusa Springnatuonals will be held here in May)
Shifter Skusa legal 44.5 seconds, top speed 86mph
world formula 51 seconds top speed 59mph
lO206 not sure about top speed but Is close to 53mph and time around 54 seconds